hotworks and welding safety

8/18/2019 Hotworks and Welding Safety

1/21


2/21

SHIELDED METAL ARC WELDING

(STICK WELDING)

• is an arc welding process in which

coalescence of metals is produced by

heat from an electric arc that is

maintained between the tip of a covered

electrode and the surface of the metal inthe joint being welded.


3/21

SHIELDED METAL ARC WELDING

(SMAW)


4/21

BASE METAL

SHIELDING

GAS

COVERING

CORE

WIRE

WELDING ELECTRODE


5/21

FUNCTIONS OF

ELECTRODE COVERING

1. Provides gas to shield the arc.

2. Provides scavengers, deoxidizers, and fluxing

agents.

. Provides a slag blan!et.

". Provides a means of alloying elements.


6/21

CHECK AND MAINTENANCE

BEFORE WORK

1. WELDER AND EQUIPMENT

•Provide correct power switch fuses.•#older insulation must be good.

•$%uipment must be grounded properly.

•&elding cable must not be damaged.


7/21

CHECK AND MAINTENANCE

BEFORE WORK

2. CLOTHES AND PROTECTORS

•'orrect wor!ing clothes must be worn.

•(se safety shoes.

•Proper welding face protector or goggles must

be ready for use.

•&or!ers must wear proper gloves, arm covers,

apron and foot covers.

•(se safety belts)body harness for wor!ing up high.


8/21


9/21

HAZARDS IN WELDING WORKS

1. $lectric *hoc! 2. +umes and ases


10/21

HAZARDS IN WELDING WORKS

. &elding *par!s ". -rc ays

/. eneral &or! -rea


11/21

CONTROL OF HAZARDS

IN WELDING WORKS

1. $lectric *hoc!

0nsulate welder. (se rubber mat or dry wood.

(se correct Personal Protective $%uipment PP$.

3o not touch electrically 4hot5 parts or electrode with

bare s!in or wet clothing.

6eep electrode holder and cable insulation in good

condition.


12/21

CONTROL OF HAZARDS

IN WELDING WORKS

2. +umes and ases

Proper ventilation. 2,777 cu. ft. per min. of air per welder.


Provide room with at least 17,777 cu. ft. per welder

with a ceiling height of at least 18 ft.


13/21

CONTROL OF HAZARDS

IN WELDING WORKS

. &elding *par!s

3o not weld on containers which have held combustible

materials.

emove flammable materials from welding area or

shield.

6eep fire extinguisher in the welding area.



14/21

CONTROL OF HAZARDS

IN WELDING WORKS

". -rc ays

-lways use helmet or mas! when welding.

(se correct lenses.


15/21

FILTER SHADE SELECTION

OPERATION ARC MIN. SUGGESTED

CURRENT SHADE SHADE

(a!)

*hielded 9etal 87 : ;

-rc &elding

87 < 187 = 17

187 < 2/7 17 12

2/7 < //7 11 1"


16/21

CONTROL OF HAZARDS

IN WELDING WORKS

/. eneral &or! -rea

6eep cables, materials, tools neatly organized.

'onnect wor! cable as close as possible to area where

welding is being performed.

-lways disconnect power to e%uipment before servicing.


17/21

HOT WORK PERMITS

&hat is a #>? &>6 P$90?@

- written permit or authorization

before welding or cutting

operations are allowed in

establishments in which the area

shall be inspected by the safety

man indicating therein theprecautions to be followed to

avoid fire or accidents.


18/21

HOT WORK PERMITS

3efinitionA

HOT WORK is any wor! using open flames

or sources of heat that could ignite

materials in the wor! area.

&elding

Brazing

*oldering>xy


19/21

HOT WORK PERMITS

ProceduresA

Before beginning hot

wor!, contact the +ire9arshal, *afety >fficer,

or 9aintenance 9anager

to have a #ow &or!

Permit issued.


20/21

HOT WORK PERMITS

$ffectivityA

Permits are issued for

the specific job beingdone, and for a specific

time period. ?he time

period is usually for the

wor!ing shift, but maynever exceed twenty four

hours.

CUTTING WELDING HOT WORK PERMIT


21/21

CUTTING – WELDING – HOT WORK PERMIT

This form is to be fill out in its entirety by the responsible person actually performing the “HOT WORK” andthen brought to the Safety Officer for approval prior to beginning the project

Company: Date:

Responsible Peson: !tat time:

Wo" to be pe#ome$: %&il$in':

Is it possible to pe#om t(is )o" in t(e s(op* +es,,,, No,,,,

Room N&mbe- .ea o E/&ipment:

Please pla0e a 0(e0" ma" i# t(e #ollo)in' items (a1e been 0omplete$

!lame or spar"#producing e$uipment to be used has been inspected and found in good repair ,,,,

Sprin"lers% &hre provided% are in commission and )ill not be ta"en o&t o# se1i0e )(ile this &or" is being

done ,,,,

There are no combustible fibers% dusts% vapors% gases or li$uids in the area Tan"s and e$uipment previously

containing such materials have been purged The absence of gases or vapors has been verified by acombustible gas detection instrument 'f there is a possibility of a lea" developing in nearby piping%

e$uipment% or tan"s% this area is being continuously monitored Call t(e !a#ety O##i0e i# assistan0e isnee$e$ to test aea ,,,,

!ire alarms &ill not be ta"en o&t o# se1i0e &hile &or" is being performed 'f alarm system must beinactivated during &or" then Safety Officer &ill be contacted prior to ta"ing alarm out of service so that a

suitable “fire &atch” can be coordinated Un$e no 0i0&mstan0es )ill #ie alams be ta"en o&t o# se1i0e )it(o&t 0onta0tin' t(e !a#ety O##i0e ,,,,

The &or" & ill be confined to the area or e$uipment specified on this permit ,,,,

Surrounding floors have been s&ept clean and% if combustible% &et do&n ,,,,

(ontractor has ample portable fire e)tinguishers available and trained personnel to use them ,,,,

*ll combustibles have been relocated +, feet from the operation and the remainder protected &ith metal

guards of flame#proofed curtains or covers -not ordinary tarpaulins. ,,,,

*ll floor and &all openings &ithin +, feet of the operations have been tightly covered ,,,,

Responsible personnel have been assigned to provide a “!ire Watch” for dangerous spar"s in the &or" area%as &ell as on floors above and belo& &hile &or" is being performed ,,,,

*rrangements have been made to provide a “!ire Watch” to patrol the area% including floors above and

belo&% duringany lunch or rest period and for at least one#half hour after the &or" has been completed

,,,,

' attest that the above precautions have been ta"en

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Peson Responsible #o Pe#omin' Hot Wo"

*pproved

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

Name o# !a#ety O##i0e an$ Date

NOTE: T(is pemit e2pies 34 (o&s a#te t(e $esi'nate$ 5stat time67

hotworks and welding safety

Documents