Craftsman 30084N Operation Manual - Page 29

6-11. Troubleshooting - Lack Of Penetration Lack of Penetration Good Penetration Lack Of Penetration - shallow fusion between weld metal and base metal. S-0638 Possible Causes Corrective Actions Improper joint preparation. Material too thick. Joint preparation and design must provide access to bottom of groove while maintaining proper welding wire extension and arc characteristics. Improper weld technique. 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. Insufficient heat input. Select higher wire feed speed and/or select higher voltage range. Reduce travel speed. 6-12. Troubleshooting - Incomplete Fusion Incomplete Fusion - failure of weld metal to fuse completely with base metal or a preceeding weld bead. Possible Causes Workpiece dirty. Insufficient heat input. Improper welding technique. Corrective Actions S-0637 Remove all grease, oil, moisture, rust, paint, undercoating, and dirt from work surface before welding. Select higher voltage range and/or adjust wire feed speed. 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. 6-13. Troubleshooting - Burn-Through Burn-Through - weld metal melting completely through base metal resulting in holes where no metal remains. Possible Causes Excessive heat input. Corrective Actions Select lower voltage range and reduce wire feed speed. Increase and/or maintain steady travel speed. S-0640 OM-194 199 Page 26