Arc Welding Notes for Metals 1

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    ARC WELDING NOTES

    ARC WELDING Shielded Metal Arc Welding (SMAW). Electricity a! it "#$%! aga!e! ga% 'eteen t& c&nd#ct&r!. r&d#ce! an arc a! inten!e a! *+++,.

    T-E! O, WELDERS

    Rectiier

    D.C. (Direct C#rrent) Electricity i! c&n/erted r&$ A.C.

    (Alternating C#rrent) thrgh tran!&r$er! and rectiier!.

    I. A.C. 0 D.C. D#al %#r%&!e

    ELECTRODES

    1!#ally 234 l&ng

    5 2 5Cla!!iicati&n 6rand na$e! dier '#t the A.W.S. n#$'er

    !y!te$ i! the !tandard7

    E8a$%le 9 E:+2; 9 E

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    III. 20; heat at the 'a!e

    and =0; heat at the r&d.

    I?. Characteri!tic!

    2. Dee% %enetrati&n

    g&&d &r thic $etal!

    =. r&ne t& arc 'l&

    ;. Alternating C#rrent 5 (A.C.)

    STRI@ING AN ARC Lie !triing a $atch tch the electr&de t& the $etal

    then circle #% and 'ac d&n t& the dia. & the r&d aay r&$ the 'a!e

    $etal.

    M&ti&n 5 (A/&id e8ce!!i/e $&/e$ent)

    A. Straight 5 ,eed in drag the %#ddle

    ROD OSITION

    V. ,lat R&d %er%endic#lar t& 'a!e $etal. Incline a't =+ r&$

    %er%endic#lar t&ard directi&n & tra/el. Drag the eld.

    (6achand)

    VI. La%% &r In!ide C&rner Angle r&d ;+ t& 3 t& 'a!e $etal.

    Incline =+ t&ard directi&n & tra/el. Drag eld.

    WELD OINTS

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    6#tt "&int %re%are "&int. Metal $#!t 'e clean. Alay! tac /ee thic

    %iece! &r %enetrati&n. 1!e a !light $&ti&n 'ac &rth.

    ,lange (edge "&int) Alay! tac. Ea!ie!t eld. Thic %iece! !hld

    'e /eed.

    La%% "&int ?ery c&$$&n. l#g r&!ette !l&t eld! are all /ariati&n! &

    the la% eld. C&ncentrate heat &n '&tt&$ %late. 1!e a !light ea/e

    $&ti&n. Alay! tac.

    In!ide C&rner (Tee "&int) EF#al eld &n each %late. ,ini!hed "&int

    !hld 'e c&nca/e t& lat. 1!e a cl&!e arc. C&ncentrate heat &n

    '&tt&$ %late. Alay! tac.

    O#t!ide "&int All& &r nat#ral /ee. Alay! tac. 1!e a !light ea/e.

    WELDING OSITIONS

    ,lat

    &ri>&ntal (&n a /ertical %lane).

    ?ertical

    O/erhead

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    RO6LEMS

    Arc 6l&

    ?II. A $agnetic &rce delect! the eld int& !%litting.

    ?III. C#re Ree!ta'li!h grnd. Sh&rten arc length.

    1nderc#t

    I

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    r&tecti/e eF#i%$ent All the li!ted eF#i%$ent %r&tect! y r&$ heat

    !%latter and har$#l ray!. (1ltra/i&let Inrared).

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