PROCEDURE SHIELDED METAL ARC WELDING (SMAW)

SHIELDED METAL ARC WELDING (SMAW) PROCEDURE

! 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

5 Electrode Holder Position

6 Arc Length Arc length is the distance from the electrode to the workpiece. A short arc with correct amperage will give a sharp, crackling sound. Correct arc length is related 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. Electrodes should be about 1/8 in. (3 mm).

7 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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