WELDING OPERATIONS I - OD1651 - LESSON 1/TASK 2
a backup bar if possible. Chip or cut out the back of the joint
and deposit a bead of weld metal at this point.
Step 2. Check the size of the electrode being used.
Do not
expect excessive penetration from an electrode.
Use small
diameter electrodes in a narrow welding groove to permit reaching
the bottom of the groove.
Step 3. Check the welding current setting.
Use
sufficient
welding current to obtain proper penetration.
Step 4. Check the welding speed.
Do not weld too rapidly.
Control the welding speed to permit penetration to the bottom of
the welded joint.
(3) Undercut.
Step 1. Check the welding current setting. Use moderate welding
current and do not try to weld at too high a speed.
Step 2. Check for proper manipulation of the electrode. Do not
use too large an electrode.
If the puddle of molten metal
becomes too large, undercut may result. Excessive width of weave
will cause undercut and should not be used. A uniform weave, not
over three times the electrode diameter, will aid greatly in
preventing undercut in butt welds.
If an electrode is held too
near the vertical plate in making a horizontal fillet weld,
undercut on the vertical plate will result.
(4) Poor Weld Appearance.
Step 1. Check welding technique for proper current and electrode
manipulation technique.
Ensure the use of the proper welding
technique for the electrode used.
Do not use excessive welding
current. Use a uniform weave or rate of travel at all times.
Step 2. Check the characteristics of type electrode used.
Use
an electrode designed for the type of weld, base metal, and the
position in which the weld is to be made.
Step 3. Check the welding position for which the electrode is
designed. Do not make fillet welds
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