smaw (2)smaw (2)smaw (2)smaw (2)smaw (2)smaw (2)
TRANSCRIPT
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Shielded Metal Arc Welding (SMAW)
Consumable Electrode Self-Shielded No pressure
is applied Filler metal
is used
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Shielded Metal Arc Welding (SMAW)
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SMAW Equipment
Constant Current Power Source AC/DC Current Cables Ground Clamp Electrode Holder
Gloes Chippin! Hammer "ire #rush
Electrodes
Safet$ Glasses Face %as&/Hood
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SMAW In Action
S%A" Fillet
"eld 'ideo
S%A" Grooe"eld 'ideo
S%A" 'ideo(in $our sparetime)
Aailable on%oodle
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Arc Stabilizers Titania TiO2
Gas-Forming Materials
Wood Pulp Limestone CaCO
Slag-Forming
Materials
Alumina Al2O TiO2 SiO2
FeO!
Slipping Agents to Aid "#trusion Cla$
Talc
Gl$cerin
%inding Agents
Sodium Silicate
Asbestos
Starc&
Sugar
Allo$ing and 'eo#idizing "lements
Fe( Si( Al( Ti( Mn( )i( Cr
SMAW Coating Materials -Partial List
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SMAW Electrode Classification Eample
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SMAW Electrode Classification !eferences
ANS*/A"S+,. Specification for Carbon Steel
ANS*/A"S+,0 Specification for Stainless Steel
ANS*/A"S+,, Specification for 1ow Allo$ Steel
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SMAW Electrode "rientation
Proper electrode orientation depends on 2$pe and si3e of electrode Position of weldin! Geometr$ of the 4oint
2rael An!le A lar!e trael an!le ma$ cause a cone56 poorl$ shaped bead with
inade7uate penetration A small trael an!le ma$ cause sla! inclusions
"or& An!le A lar!e wor& an!le can cause undercuttin! A small wor& an!le can result in lac& of fusion
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SMAW Ad#antages
Easil$ implemented
*ne5pensie
Fle5ible
Not as sensitie to partfit-up ariances
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2he e7uipment is relatiel$ eas$ to use6 ine5pensie6and portable
2he filler metal and means for protectin! the weld poolare proided b$ the coered electrode No e5ternall$ supplied shieldin! !as is needed
1ess sensitie to wind6 dirt$ parts6 and poor part fit-up E5cellent for outdoor pro4ects
Can be used on carbon steels6 low allo$ steels6 stainlesssteels6 cast irons6 copper6 nic&el6 aluminum
SMAW Ad#antages
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1ow Deposition 8ates 9 : lbs/hour
1ow Productiit$ Continuousl$ chan!in! electrodes Sla! must be remoed at starts and stops6 as well as
in between passes
;perator Dependent S&ill leel < hi!h leel re7uired Does the welder feel li&e wor&in! toda$= Coffee brea&s Smo&e brea&s Chit-chattin!
SMAW Limitations
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2he heat of weldin! is toohi!h for lead6 tin6 3inc6 andtheir allo$s
2here is inade7uate weldpool shieldin! for reactiemetals such as titanium63irconium6 tantalum6 and
columbium
SMAW Limitations
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SMAW$Essential Parameters
Parameter Approximate ValueApplication %ethod %anual
Current (A) .>>>? electrode diameter e5pression as decimal inch
2rael Speed :-.> ipm
Current Polarit$ DCEP6 DCEN6 AC
Power Source 2$pe CC
Electrode 2$pe/Composition E@>.>6 E>.B6
Electrode Diameter ./.@ to ./:
2rael An!le push to pull
"or& An!le -0, to 0, de!rees
Arc 1en!th dra! to ./B
Electrode/2orch %anipulation strin!er or weae"eldin! Position(s) flat6 hori3ontal6 ertical6 oerhead
"eldin! Pro!ression ertical up or down