weld 1100 - shielded metal arc welding - College of Eastern Utah
weld 1100 - shielded metal arc welding - College of Eastern Utah
weld 1100 - shielded metal arc welding - College of Eastern Utah
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Weld Quality<br />
Arc Blow – Colliding magnetic fields.<br />
– A magnetic field in the base <strong>metal</strong>, table or fixture interacts<br />
with the magnetic field surrounding the <strong>weld</strong> rod. Can cause<br />
porosity, slag inclusions, lack <strong>of</strong> fusion and other flaws.<br />
– Corrective Actions: 1. Short <strong>arc</strong> gap, 2. Change rod angle to<br />
counteract, 3. move work clamp, 4. Change <strong>weld</strong>ing<br />
direction, 5. Use back-step technique, 6. Change from DC to<br />
AC, 7. Add run<strong>of</strong>f plates & Tabs, 8. Last Resort: Wrap work<br />
cable around work piece a few times.<br />
Porosity – Gas bubbles<br />
– Usually caused by contaminated rod or base <strong>metal</strong>.<br />
Slag Inclusions – Non-<strong>metal</strong>lic inclusions<br />
– Causes: poor cleaning, rod angle (drag), amperage (too low),<br />
and bead placement.
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