Introduction
Incomplete
Penetration
Lack of
Longitudinal
Undercutting
Fusion
Porosity
Cracking

 

 

 

Variations-
Metal
Transfer
Equipment
Power
Supply
Shielding
Gases
Wire
Electrodes
Safety
Welding
Techniques
Welding
Conditions
Economics
Weld
Defects
Mig Spot
Welding
Tables

 

11 Table 10-1 – Weld Troubleshooting FAULT OR DEFECT CAUSE AND/OR CORRECTIVE ACTION 1) POROSITY                                                                         A. OIL, HEAVY RUST, SCALE, ETC. ON PLATE B. WIRE – MAY NEED WIRE HIGHER IN Mn AND Si C. SHIELDING PROBLEM; WIND, CLOGGED OR SMALL      NOZZLE, DAMAGED GAS HOSE, EXCESSIVE GASFLOW, ETC. D. FAILURE TO REMOVE GLASS BETWEEN WELD PASSES E. WELDING OVER SLAG FROM COVERED ELECTRODE 2) LACK OF PENETRATION A. WELD JOINT TOO NARROW B. WELDING CURRENT TOO LOW; TOO MUCH C. ELECTRODE STICKOUT WELD PUDDLE ROLLING IN     FRONT OF THE ARC 3) LACK OF FUSION A. WELDING VOLTAGE AND/OR CURRENT TOO LOW B. WRONG POLARITY, SHOULD BE DCRP C. TRAVEL SPEED TOO LOW D. WELDING OVER CONVEX BEAD E. TORCH OSCILLATION TOO WIDE OR TOO NARROW F. EXCESSIVE OXIDE ON PLATE 4) UNDERCUTTING A. TRAVEL SPEED TOO HIGH B. WELDING VOLTAGE TOO HIGH C. EXCESSIVE WELDING CURRENTS D. INSUFFICIENT DWELL  AT EDGE OF WELD BEAD Continued on next page...