Miller Shielded Metal Arc Welding Manuallines - Strona 8
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SECTION 3 − SHIELDED METAL ARC WELDING (SMAW)
3-1. Typical Stick Welding Set-Up
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1
Tools Needed:
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PROCEDURE
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4
7
Y Welding current starts as soon as
electrode touches the workpiece.
1
Workpiece
Make sure workpiece is clean before
welding.
2
Work Clamp
Place as close to the weld as possible.
3
Electrode
Before striking an arc, insert an electrode
in the electrode holder. A small diameter
electrode requires less current than a
large one. Follow recommendations of
the electrode manufacturer when setting
weld amperage (see Section 3-2).
4
Insulated Electrode Holder
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Electrode Holder Position
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Arc Length
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Arc length is the distance from the elec-
trode to the workpiece. A short arc with
correct amperage will give a sharp,
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crackling sound. Correct arc length is re-
lated to electrode diameter. Examine the
weld bead to determine if the arc length
is correct.
Arc length for 1/16 and 3/32 in diameter
electrodes should be about 1/16 in (1.6
mm); arc length for 1/8 and 5/32 in elec-
trodes should be about 1/8 in (3 mm).
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Slag
Use a chipping hammer and wire brush to
remove slag. Remove slag and check
weld bead before making another weld
pass.
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