MICRO PRODUCTS COMPANY

MANUFACTURERS OF PRECISION WELDING MACHINES

RW 1,2,3,4 RING/BUTT WELDERS

SERVICE MANUAL

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TABLE OF CONTENTS 1.0 SPECIFICATIONS 2.0 GENERAL HOOK-UP INSTRUCTIONS 3.0 GENERAL OPERATING INSTRUCTIONS 4.0 SUGGESTED SETTINGS 5.0 TYPICAL OPERATING SEQUENCE 6.0 ANNEALING INFORMATION 7.0 SPECIAL ADJUSTMENTS 8.0 PREVENTATIVE MAINTENANCE 9.0 DIAGNOSTIC CHART FOR TROUBLE-SHOOTING 10.0 ELECTRICAL SCHEMATIC 11.0 SAFETY REMINDERS 12.0 BUYERS GUIDE 13.0 PARTS LIST 1.0 SPECIFICATIONS Model RW1 Model RW2 Model RW3 Model RW4 Stock Size Range, Diameter

.030” to .187”

.125” to .312”

.250” to .375”

.312” to .500”

Material Steel Steel Steel Steel Upset/Clamp Method Pneumatic Pneumatic Pneumatic Pneumatic Input Power Cycle

60 Hertz 60 Hertz

60 Hertz

60 Hertz

Line Demand, 460 volts

8 amps@100% 24 amps@10%

15 amps@100% 49 amps@10%

23 amps@100% 73 amps@10%

31 amps@100% 98 amps@10%

Line Demand 230 volts

15 amps@100% 49 amps@10%

31 amps@100% 98 amps@10%

46 amps@100% 145 amps@10%

62 amps@100% 196 amps@10%

Heat Selection SCR Control

SCR control

SCR Control

SCR Control

50% duty cycle rating

5 KVA

10 KVA

20 KVA

30 KVA

DIMENSIONS AND WEIGHTS

4-Wheel Truck Mounted

2 Stationary Casters 2 Swivel Casters

2 Stationary Casters 2 Swivel Casters

2 Stationary Casters 2 Swivel Casters

2 Stationary Casters 2 Swivel Casters

Floor Space 24” x 24” (61cm x 61cm)

24” x 24” (61cm x 61cm)

24” x 24” (61cm x 61cm)

24” x 24” (61cm x 61cm)

Welding Die Height 44”

44”

43”

43”

Height Overall 46 in.

46 in.

46 in.

46 in.

Welder Weight 262Lbs(120 Kg) 280Lbs(130 Kg) 485LBs(220 Kg) 520Lbs(230 Kg)

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2.0 GENERAL HOOK-UP INSTRUCTIONS 2.1 ELECTRICAL

First Determine that available electrical service in your plant corresponds to the nameplate rating located on the welder housing. Electrical wiring to the welder must be of sufficient size to deliver full ampere load with no appreciable loss during the weld cycle. The welder will not operate properly if there is more than a 10% variation in the line voltages. In general, the welder should be fused with a slow blow fuse of the 100% duty cycle rating. The minimum power cable size to the welder can be obtained by using this same current rating. Refer to the National Electric Code and local electrical regulations for adequate power sizes; disconnect methods, and fusing guidelines. Remember, line voltages to the welding machine are potentially dangerous should the power cords be damaged or severed. The welding voltages at the welding dies will not harm an operator, since they do not exceed 5 volts.

2.2 SAFETY PRECAUTIONS 2.2.1 ELECTRICAL

Maintain electrical cable to welder in good repair. Welder must be grounded and connections securely tightened. Heat switch must not be changed to new position while a weld cycle is in process. Disconnect electrical service before servicing welder – high voltages are located within the base of the welder.

2.2.2 MECHANICAL

Safety glasses must be worn by operator while using welder. Keep all safety guards on welders and use properly. Operators must be instructed on basic operation of unit to prevent injury. Check nameplate rating and keep within material size range for each welder.

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2.3 WATER It is important that if a welder is to be operated for an extended period of time and headpieces heat up, water lines must be connected. On most model RW series Micro-Weld welders, water-cooled headpieces are an option, which can be added at our factor. Connect hoses to inlet and outlet provided at the back of the welder. A shut-off should be installed in the inlet line, and the hose from the outlet should run to an open sight drain. Water should only flow during the weld cycle and the temperature of the water at the drain should feel hot to the hand. This will prevent condensation on the welder headpieces, which could drip on the welding transformer and cause it to ground out.

2.4 AIR

Air operated cylinders require a 90 P.S.I. air source. Air regulators are provided to set the minimum amount of pressure needed for the material being welded.

2.5 WELDING DIES

The dies and shoes supplied with the welder will handle most size and material types within the range of the welder. For new weld applications consult the factory for special die and shoe sets.

2.6 ELECTRONIC CONTROLLER*

The Micro Model-105 Single Phase Welder Control utilizes low power consumption and incorporates State-of-the-art computer design. Three (3) separate programmable weld schedules allow the operator the flexibility of different machine settings by a simple switch selection. An internal battery powers the memory circuits when machine power is disconnected, thus, all three (3) weld schedules are retained in memory (up to 30 days) eliminating the need to re-program when power is reconnected. Programming of the control is accomplished through a push-button type keyboard and displayed on an easy to read L.E.D. display. A lamp for each function will light as the control enters that function. See 2.7.1 through 2.7.7. *Consult controller manual for addition operating details.

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2.7.0 CONTROLLER PROGRAMMABLE FUNCTIONS 2.7.1 Squeeze Time: 0-99 cycles 2.7.2 Impulses (cool-heat multiplier) 0-99 (OPTIONAL) 2.7.3 Cool Time: 0-99 cycles (OPTIONAL) 2.7.4 Heat Time: 0-99 cycles 2.7.5 Heat %: 0-99 cycles 2.7.6 Hold Time: 0-99 cycles 2.7.7 Off Time: 0-99 cycles 2.7.8 Repeat On: repeats cycle with foot switch depressed 2.7.9 Weld On: allows electric current flow through welding electrodes 2.7.10 Seam On: not used 2.7.11 Tip Wheel Dress: not used 2.7.12 Weld Schedules: 1,2, or 3 may be programmed by first

depressing the key corresponding to the weld schedule desired. The advancing through the program selections and keying in the desired values.

2.8.0 KEYBOARD PROGRAMMING 2.8.1 Keys 0 through 9 are used to enter a two-digit variable time for each function. The RED key is used to start and advance the sequence functions while displaying the time counter contents. 2.8.2 In the run mode, that is while the welding controller is

Operating or in the off state, the two digit display above the keyboard is not on.

2.8.3 When the RED key is first depressed, the two-digit display will turn on displaying the timing contents of that Specific function pointed to by the LED (light) ON: Adjacent to the function written on the front panel. 2.8.4 The display timing contents can be changed by depressing

0-9 numbers on the keyboard. 2.8.5 Continued depression of the RED key will step through all

The sequential functions 2.7.1 through 2.7.7 and then the Two-digit display will turn off.

2.8.6 FOOT SWITCH OPERATION 2.8.7 When the foot switch is depressed the welder will perform

the weld schedule selected by the WELD SCHEDULE program selector switch.

2.8.8 If the foot switch is released prior to the end of squeeze time, the controller will bypass all sequential functions and return to off (idle mode).

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3.0 GENERAL OPERATING INSTRUCTIONS BASIC OPERATING PARTS

3.1 WELD HEAT SELECTION

This setting determines the amount of heat available for welding. Because of considerable variations in voltage and power factors in various plants, and wide variety in material composition, exact heat setting cannot be specified. In general, larger sizes of stock use higher heat settings. Welding heat level is selected by means of the programmed HEAT percentage. The heat can be set from 0 to 99%. The weld duration as well as the heat level controls the amount of heat delivered to the weld zone. The HEAT TIME is programmed from 00 to 99 cycles.

3.2 SPACING MECHANISM

The welder is capable of welding a variety of material sizes, but each major change in material size requires a corresponding change be made in the open position of the welder heads. The movable head on the right side has adjusting nuts on the upset pull bar that runs through the movable head. Two nuts are located on the right side of the movable head and two on the left side of the movable head.

3.2.1 TO INCREASE OPEN SPACE

Loosen the two nuts (A) on the right end of the movable head, on the pull bar, (A) and unscrew them the distance you want to increase the open space, then tighten the two nuts (B) on the left side of the movable head, on the pull bar, hold the pull bar stationary within the movable head.

3.2.2 TO DECREASE OPEN SPACE

Loosen the two nuts (B) on the left end of the movable head, on the pull bar, (H) and unscrew them the distance you want to decrease the open space, then tighten the two nuts (A) on the right side of the movable head, on the pull bar, to hold the pull car stationary within the movable head.

NOTE: A. The open space and closed space is measured between the dies.

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B. The weld heat duration determines the amount of weld upset and expelled metal projecting from the weld zone. C. All welds should be completed before the closed space stop screw (E) touches the movable head. D. The amount of open space must be sufficient to allow the weld to take place completely without making contact with the closed stop screw (E).

3.2.3 TO SET CLOSED STOP SCREW

The closed stop screw is set at the factory to provide .010” space between dies when the heads are in the full upset (closed) position.

Eventually due to wear, the screw may have to be readjusted. If so, follow this procedure: A. Turn power off so dies won’t weld to each other. B. Squeeze stationary and movable head together. C. Loosen locknut (J). D. With scale at inside edges of dies, turn head stop (E)

until there is .010” between inside edges of dies, then tighten locknut (J).

E. Release heads. 3.3 UPSET PRESSURE MECHANISM

Set the air regulator on the left side of the welder housing. The upset pressure is changed by adjusting the UPSET air regulator located on the left of the welder.

3.4 UPSET PRESSURE TIME

The amount of time pressure is applied to the weld zone prior to application of heat is called SQUEEZE. The SQUEEZE time is programmed in a range of 00 to 99 cycles.

3.5 WELDING DIES AND DIE SHOES

Welding dies serve three purposes: (1) to carry current and voltages for welding, (2) to align material ends, and (3) to prevent slippage during the weld cycle. Small wire must be placed into small grooves and large wire into the large grooves. Flat stock must be placed against the stop in the rear of the dies. The die shoe holds the material securely into the lower welding die during the weld process.

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3.6 CLAMPING MECHANISM The clamping pressure is controlled by adjusting the CLAMP AIR REGULATOR located on the left of the welder. Enough clamp pressure must be provided to prevent the material from slippage in the dies.

3.7 FOOT SWITCH CONTROL

All operations on the welder are performed by a single down-stroke of the foot switch, when the foot switch is released, the operating parts are automatically re-spaced, ready for the next weld operation.

4.1 WELDING DIES AND DIE SHOES INFORMATION

Description: Welding dies – Lower conducting electrode and clamp jaw Welding die shoes – Upper clamping member Welding dies and die shoes in poor condition are the main causes of bad welds.

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Care of die sets: 1. Use a brass or fiber blade to remove particles of

flashings that build-up on die sets. Excessive flash build-up causes die burns on material and shorting of die sets.

2. Do not attempt to clamp material that is not suited for welder into dies sets. Undersize material will slip and burn die grooves, oversize materials will overstress clamping parts.

3. Do not use welding die sets for a vise. These parts will not withstand the mechanical abuse.

4. Whenever welding dies are replaced, clean bottoms of dies and corresponding die seats to a bright and clean condition before bolting them tightly into place. An oxidized surface will insulate the welding dies and reduce effective welding voltage.

5. Welding die shoes must swivel freely within clamp arm pivots to prevent cracking of die shoes. File down die shoe boss if necessary.

6. Welding die sets will wear with use and must be changed occasionally for good welding results. Keep an adequate supply of replacement parts available. Wire and rod slippage is a problem caused by poor die sets and a major cause of wire breaks.

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5.0 TYPICAL SEQUENCE OF OPERATION

Wire to be joined must be free of rust, corrosion or other insulating materials where it contacts welding dies.

5.1 Cut wire ends to best joint configuration. 5.2 Set welding platen for proper die opening. 5.3 Select proper weld heat range. 5.4 Place wire into welding dies so as the ends touch and abut

midway between welding dies. 5.5 Push foot switch down to clamp and start weld process. 5.6 Heat is imparted to wire ends through faying surfaces. 5.7 Movable platen under upset pressure moves toward a closed

position due to loss of compression yield strength of wire. 5.8 A weld controller terminates electrical power flow through

wire 5.9 Actual weld or coalescence is formed after electrical power

flow stops and material is hot forged together with remaining upset pressure.

5.10 Welded material quickly cools under pressure. 5.11 Remove stock from dies by releasing foot switch. 6.0 SPECIAL ADJUSTMENTS 6.1 HEADPIECE OPEN ADJUSTMENT

(Adjusts open position of headpiece) Adjustment See 3.2.1 and 3.2.2 (4D) Rotate space adjusting nuts as needed to provide the desired open space between the dies. Then lock the nuts into position.

6.2 HEADPIECE CLOSED ADJUSTMENT

(Prevents welding dies from touching) Adjustment See 3.2.3 (4.0) Make the adjustment, by using headpiece closed adjusting screw, so that when the movable headpiece is pushed by hand the dies will not touch and have approximately .005” to .010” between welding dies.

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7.0 PREVENTIVE MAINTENANCE TECHNIQUE Keep in Mind that these welders are precision built to last many years, but will require good maintenance procedures. They are designed to be as automatic as possible with a minimum dependence on the ability of the operator. Adjustments must be made by those thoroughly familiar with the operating principles of the welders.

7.1 WELDING DIE NOTES 7.1.1 Welding dies and die shoes in poor condition are the

primary caused of bad welds. 7.1.2 Check die sets for excessive wear and replace if necessary. 7.1.3 Clean weld die bottoms to remove oxides with emery cloth

placed on a flat surface. 7.1.4 Clean die seats with emery cloth to brighten contact areas. 7.1.5 After cleaning of dies be sure to wipe off with soft clean

cloth. 7.1.6 Completely tighten dies into seats to assure a good

contact. 7.1.7 Worn die shoes will not hold stock during a weld cycle,

change steel faces or replace complete shoes. 7.2 WEEKLY 7.2.1 Tighten all loose parts. 7.3 QUARTERLY 7.3.1 Repeat above service items. 7.3.2 Check grease requirements on clamp arms pivot shafts and

lubrication points. 7.3.3 Check anneal parts and replace all worn or broken

assemblies 7.3.4 Check contacts on magnetic contactor for worn contacts. 7.3.5 Clean heat switch contacts with low residue cleaner and

recoat with petroleum jelly. 7.4 ANNUALLY 7.4.1 Repeat previously noted items. 7.4.2 Check for wear in clap arm pivots. 7.4.3 Clean inside and outside of welder. 7.4.4 Check grease requirements on headpiece slide shafts, grease

lightly. 7.4.5 Caution: make sure that power supply is disconnected before

servicing welder in anyway!

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7.5 WELDING DIES AND DIE SHOES INFORMATION

Description: Welding dies – Lower conducting electrode and clamp jaw. Welding die shoes – Upper clamping member. Welding dies and die shoes in poor condition are the main causes of bad welds.

Care of die sets: 7.5.1 Use a brass or fiber blade to remove particles of flashings

that build-up on die sets. Excessive flash build-up causes die burns on material and shorting of die sets.

7.5.2 Do no attempt to clamp material that is not suited for

welder into die sets. Undersize materials will slip and burn die grooves, oversize materials will overstress clamping parts.

7.5.3 Do not use welding die sets for a vise. These parts will not withstand the mechanical abuse.

7.5.4 Whenever welding dies are replaced, clean bottoms of dies

and corresponding die seats to a bright and clean condition before bolting them tightly into place. An oxidized surface will insulate the welding dies and reduce effective welding voltage.

7.5.5 Welding die shoes must swivel freely within the clamp arm pivots to prevent cracking of die shoes. File down die shoe boss if necessary.

7.5.6 Welding die set will wear with use and must be changed

occasionally for good welding results. Keep and adequate supply of replacement parts available. Wire and rod slippage is a problem caused by poor die sets and a major cause of wire breaks.

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8.0 SUGGESTED SETTINGS 8.1 CLAMP PRESSURE 8.1.1 The clamp pressure is typically set for 30 lbs. For all stock up to middle of size range. For larger sizes 40 to 60 lbs. is recommended. 8.2 UPSET PRESSURE 8.2.1 For air operated welders set the pressure to 30 lbs. for

steel diameters from the minimum up to mid range of the welder size specification. For larger than middle or range sizes the air regulator may be gradually adjusted upward until the maximum size material is reached. For most applications the maximum pressure setting is 60 lbs. For non-ferrous materials, lesser setting should be used. Consult the factory for non-ferrous applications.

8.3 WELD TIME

The weld current time is controlled to the nearest cycle. The timer has a range of settings from 01 to 99 cycles. For most material sizes 15 cycles may be used. This is only a suggested mid range value, and will be determined by the (welds per minute) requirement of the welding task. When larger material sizes are to be welded, first increase the heat setting then readjust the weld time to obtain the desired weld.

8.4 WELD HEAT 8.4.1 The heat level is controlled from 0 to 99 percent. 8.4.2 The level selected should be lowest value consistent with

good weld quality. In order to increase the weld per minute, rate it may be necessary to increase the heat level above what might be needed on a lower production basis.

8.5 WELD QUALITY 8.5.1 Figure 1 illustrates the types of welds obtainable on a butt welder. The stronger welds are those that have the larger weld burr. 8.5.2 It is possible to reduce the size of the burr and still

obtain a strong weld. If the weld parameters are set to completely eliminate the burr, the weld strength will be reduced and may not meet the required weld tests.

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8.5.3 If a reduced burr weld is desired the stock to be welded should first be flush cut on the rod ends that are to be joined.

8.5.4 If the weld burr is too large, reduction of the upset

pressure will result in a reduced burr. Lowering of the upset pressure generally requires that the weld heat level also be reduced. This can be accomplished by decreasing the number of heat cycles or lowering the heat percentage.

8.5.5 The control supplied on this welder allows programming of

multiple heat impulses to the weld zone. (OPTIONAL FEATURE) It has been demonstrated that for certain types of materials the heat impulse feature can aid in obtaining a reduced weld burr, while holding the reduction on weld strength to minimum.

8.5.6 Below is a sample of weld parameters used to obtain a good

weld by conventional single impulse welding. The corresponding weld parameters are shown using multiple impulse welding. To obtain a reduced burr on the same type and size of material, both two and three impulse programs are illustrated.

The values shown are typical for the low end of the welder capacity range. For larger sizes of material use increasing heat levels and heat time settings.

8.6 SINGLE

IMPULSE TWO

IMPULSE THREE

IMPULSE Clamp pressure 40 lbs. 40 lbs. 40 lbs. Upset pressure 30 lbs. 30 lbs. 30 lbs. Squeeze time 20 cycles 20 cycles 20 cycles Hold time 20 cycles 20 cycles 20 cycles Off time 10 cycles 10 cycles 10 cycles Impulses 01 02 03 Heat level 30 percent 30 percent 30 percent Heat time 15 cycles 07 cycles 04 cycles Cool time 00 cycles 05 cycles 03 cycles

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9.0 DIAGNOSTIC CHART FOR TROUBLE-SHOOTING WELDING ACTION CAUSE REMEDY Weld action normal but weld burr doesn’t extend beyond wire

Lack of open space

Increase open space until desired burr is obtained

Molten metal is blown out and ends not joined

Weld heat too high Weld limit switch Stock is too small Weak clamp spring

Lower heat settings Set limit switch properly Check size rating of welder Replace clamp springs

Weld area heats up but weld is not complete

Low heat Secondary transformer connections Loose or dirty welding dies Starting space adjust

Increase weld heat Clean and tighten transformer connections Clean welding dies and surfaces Decrease starting space

Weld has complete burr but is dry and breaks off below surface of wire

Upset pressure too great Limit switch settings High carbon steel wire

Lower upset pressure Reset limit switch to specifications Carbon-steel wire often appears like this, process wire by annealing weld before removing burr

Welds good but poorly aligned

Welding dies & die shoes Starting space Loose pivot centers

Replace worn dies and shoes Decrease starting space Return heads to factory

Ends of wire buckle and may not weld

Upset pressure too great Low weld heat

Decrease upset pressure Increase weld heat

Varying weld results Stock slipping Varying weld voltages Rod condition variations Dies and die shoes Flashings Rod cuts

Worn dies and shoes Check electric lines Clean and tighten transformer connections to heads Clean rod where clamped in dies Replace dies and shoes Clean build-up of flash materials

9.1 ELECTRICAL TROUBLE-SHOOTING OF WELDER

(Caution!! Extreme care should be exercised when making these tests. Dangerous voltages are present in the welder. Only persons familiar with electrical safety precautions should perform these tests.)

9.1.1 TROUBLE-SHOOTING TABLE

(see section 9.1.3 ) This electrical trouble-shooting table is furnished as a suggested method of trouble-shooting the welder. The individual steps of the table should be performed in the order given, to make the test valid. The electrical schematic (section 10) furnished for these tests shows the table test points. This table may be used for welders with a different but closely related wiring by using corresponding test points. During all tests, line voltage should be connected to L1 & L2 of the welder.

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9.1.2 FINAL ELECTRICAL CHECKS

Set the heat to 99% and 99CYL on the control. Connect the voltmeter across the welding dies. Press the operating switch. The meter reading will typically be less than 10 VAC. Consult the weld specification sheet for this value.

9.1.3 MODEL RW1,2,3,4 – Use Schematic C5820

CONTROL TEST

LEAD CONNECTION

METER READING

PROBLEM IF NO READING

PRESS FOOT

SWITCH

CONTROL HEAT

SETTINGS

CONTROL HEAT CYCLE

SETTINGS L2 SCR-K1 Line Voltage Open wire or open FU1 fuse TB2-9 TB2-10 115 VAC Bad control transformer T2

or FU3,4 fuse open

* TB1-18 TB1-19

10 volt pulse

Bad Control pulse output X

50%

99CYL

TB2-3 TB2-8

115 VAC Bad control output to air valves

X

L2 H1 Approximately 50% of line

voltage

Bad SCR pack X

50%

99CYL

L2 H1 Approximately 100% of line

voltage

Bad SCR pack X

99%

99CYL

** TB1-11 TB1-12

0 Ohms

Temperature switch open

** TB1-15 TB1-23

0 Ohms FS1 foot switch open X

Note: to perform repairs consult section 13 for parts identification *CAUTION! An isolated scope must be used for this test. Consult control manual for additional tests. ** Power must be removed from the welder for these tests.

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10.0 ELECTRICAL SCHEMATIC

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11.0 SAFETY REMINDERS The following accident prevention information is presented to eliminate potential hazards while operating, inspecting or repairing Micro-Weld electric resistance welding equipment. Important safety compliance information for Micro-Weld Welders. GENERAL 1. Prior to using equipment, an operator must be instructed on

basic operation and malfunction methods, by qualified personnel.

2. Safety eyeglasses must be worn by all personnel operating or servicing welders.

3. Use safety equipment properly and keep safety equipment on welders.

4. Determine that both operating voltages and hertz (cycles) of power supply correspond to ratings listed on weld nameplate located on weld housing.

5. Check nameplate ratings and keep within capacities and material categories stated therein.

6. Adjustment or repairs must be made by persons thoroughly familiar with operating principles of welder.

7. Welder must be disconnected from power supply prior to maintenance or repair procedures.

8. Reduce air supply pressures or disconnect from air source, for pneumatically equipped welders, prior to maintenance or repair procedures.

9. Welders equipped with water cooling accessories must have water supply turned off during idle periods and allow only enough water to flow to cool heated components during weld operation.

ELECTRICAL 1. Refer to National Electrical Code and local regulations for

adequate electrical wiring to power welder. Do not operate welder with inadequate electrical power supply cords or cable.

2. All welders must be ground through power supply and welder ground connection terminal securely tightened.

3. All welders must be able to be disconnected from power source either by a double breaking disconnect switch or unplugged by standard rated plugs.

4. All welders must be fused to prevent injury should an electrical malfunction occur. Welders must never be fused for an ampere load that exceeds the ratings stated on weld nameplate. Normally welders are fused using the nameplate rated load; time lag parameters functional to standard fuses allow this specification.

5. Electric power cords to welder must be kept in good condition. Report any damage or potential hazards to maintenance personnel.

6. The weld heat selection switch, potentiometer or range selection devices must not be changed to a new position while a weld operating is in process.

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12.0 BUYERS GUIDE HOW TO ORDER PARTS: You must provide

1. Machine Model 2. Machine Serial Number 3. Voltage Then identify part(s) on part list (last page in book) and provide MICRO with the circled number CALL MICRO at 800-872-1068 Or fax to: 630-787-9360 Provide MICRO with your company name, address and purchase order number.

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13.0 PARTS LIST

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PARTS LIST RW1-2-3-4 SERIES RING WELDERS MODEL/ PART NO. DESCRIPTION ITEM # RW-01 Head basic 39200 RW-02 Head complete 39225 RW-03 Shaft shield 35515 RW-04 Slide shaft bearings 48401 RW-05 Closed head stop 39203 RW-06A Front arm bushing 39228 RW-06B Rear arm bushing 93229 RW-07 Key 92503 RW-08L Left clamp arm 39205 RW-08R Right clamp arm 39204 RW-09 Clamp cylinder 39201 RW-09A Clamp cylinder Bracket 77933 RW-09B Clevis 39213 RW-09D Clamp link 39206 RW-10 Clamp lever 39206 RW-11 Clamp arm spacer 39210 RW-12 Clamp lever link bolt 93109 RW-13 Upset cylinder 77893 RW-14 Upset coupling 39202 RW-15 Insulating washers 92905 RW-16 Pull rod 39207 RW-17 Insulating tube 39208 RW-18 Nipple 94050 RW-19 90 degree el 94001 RW-20 Hose fitting 94307 RW-28 Regulator bracket 77952 RW-30 Filter/regulator/lubricator 77951 RW-31 Air Gage 77961 RW-32 Quick release air coupling 86128 RW-33 Electric sub plate 36082 RW-34 Terminal strip 57699 RW-35 Line block 53000 RW-36 Transformer 59203 RW-37 Transformer ring 55505 RW-37A Transformer stud 39209

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PARTS LIST RW1-2-3-4 SERIES RING WELDERS MODEL/ PART NO. DESCRIPTION ITEM # RW-38 Control step-down 57600 RW-39 Fuse holder 58119 RW-39A Fuse 58102 RW-40 Time delay relay 57698 RW-41 Air valve 77960 RW-42 Foot switch 57869 RW-RA1 Air sub plate 36134 RW-RA7 Street el 90 degree 94151 RW-RA6 El 90 degree 94003 RW-RA5 Tee 94201 RW-RA4 Hose fitting 94304 RW-RA3 Nipple 94056 RW-RA2 Connector 86164 RW-RA8 Muffler 77892 RW-58 Weld dies 32531 RW-59 Die bolt 90604 RW-60BC Shoes 32535 RW-60S Shoes, steel faced 32534 RW-SS1 Solid state control Appl. RW-SS2 SCR pack 58501 RW-SS3 Heat sink 58132 RW-SS4 Resistor 58135 RW-SS5 Fuse 36135 RW-SS6 Fuse holder (set) 36132

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PARTS LIST RW1-2-3-4 SERIES RING WELDERS MODEL/ PART NO. DESCRIPTION ITEM # RW-121 Flash shield 39217 RW-122 Flash shield bracket 39218 RW-105 Weld transformer 460V 59204 RW-105A Primary 230V 59211 RW-105B Secondary 230V 59213 RW-103 Truck 49200 RW-131 Stationary mounts (set of 4) 42613 RW-132 Caster, stationary 48101 RW-132 Caster, movable 48100