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

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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 [email protected]>.>6 E>.B6

    Electrode Diameter ./[email protected] 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