Troubleshooting − Lack Of Penetration; Troubleshooting − Incomplete Fusion; Troubleshooting − Burn-Through - Hobart Handler 125 EZ Owner's Manual

8-11. Troubleshooting − Lack Of Penetration
Lack of Penetration
Possible Causes
Improper joint preparation.
Improper weld technique.
Insufficient heat input.
8-12. Troubleshooting − Incomplete Fusion
Possible Causes
Workpiece dirty.
Insufficient heat input.
Improper welding technique.
8-13. Troubleshooting − Burn-Through
Possible Causes
Excessive heat input.
OM-923 Page 32
Lack Of Penetration − shallow
fusion between weld metal and
base metal.
Good Penetration
Material too thick. Joint preparation and design must provide access to bottom of groove while
maintaining proper welding wire extension and arc characteristics.
Maintain normal gun angle of 0 to 15 degrees to achieve maximum penetration.
Keep arc on leading edge of weld puddle.
Be sure welding wire extends not more than 1/2 in (13 mm) beyond nozzle.
Set Metal Thickness Selector switch to a higher selection.
Reduce travel speed.
Incomplete Fusion − failure of weld metal to fuse completely with
base metal or a preceeding weld bead.
Remove all grease, oil, moisture, rust, paint, undercoating, and dirt from work surface before
welding.
Set Metal Thickness Selector switch to a higher selection.
Place stringer bead in proper location(s) at joint during welding.
Adjust work angle or widen groove to access bottom during welding.
Momentarily hold arc on groove side walls when using weaving technique.
Keep arc on leading edge of weld puddle.
Use correct gun angle of 0 to 15 degrees.
Burn-Through − weld metal melting completely through base metal
resulting in holes where no metal remains.
Set Metal Thickness Selector switch to a lower selection.
Increase and/or maintain steady travel speed.
Corrective Actions
Corrective Actions
Corrective Actions
S-0638
S-0637
S-0640