smaw (2)smaw (2)smaw (2)smaw (2)smaw (2)smaw (2)

7/25/2019 smaw (2)smaw (2)smaw (2)smaw (2)smaw (2)smaw (2)

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Shielded Metal Arc Welding (SMAW)

Consumable Electrode Self-Shielded No pressure

is applied Filler metal

is used


2/13

Shielded Metal Arc Welding (SMAW)


3/13

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


4/13

SMAW In Action

S%A" Fillet

"eld 'ideo

S%A" Grooe"eld 'ideo

S%A" 'ideo(in $our sparetime)

Aailable on%oodle


5/13

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


6/13

SMAW Electrode Classification Eample


7/13

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


8/13

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


9/13

SMAW Ad#antages

Easil$ implemented

*ne5pensie

Fle5ible

Not as sensitie to partfit-up ariances


10/13

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


11/13

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


12/13

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

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smaw (2)smaw (2)smaw (2)smaw (2)smaw (2)smaw (2)