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

 

12 5) CRACKING                                                                         A. INCORRECT WIRE CHEMISTRY B. WELD BEAD TOO SMALL C. POOR QUALITY QF MATER IAL BEING WELDED 6) UNSTABLE ARC A. CHECK GAS SHIELDING B. CHECK WIRE FEED SYSTEM 7) POOR WELD STARTS OR WIRE STUBBING A. WELDING VOLTAGE TOO LOW B. INDUCTANCE OR SLOPE TOO HIGH C. WIRE EXTENSION TOO LONG D. CLEAN GLASS OR OXIDE FROM PLATE 8) EXCESSIVE SPATTER A. USE Ar-CO2 OR Ar-O2 INSTEAD OF CO2 B. DECREASE PERCENTAGE OF He C. ARC VOLTAGE TOO LOW D. RAISE INDUCTANCE ANO/OR SLOPE 9) BURNTHROUGH A. WELDING CURRENT TOO HIGH B. TRAVEL SPEED TOO LOW C. DECREASE WIDTH OF ROOT OPENING D. USE Ar-CO2 OR Ar-O2 INSTEAD OF CO2 10) CONVEX BEAD A. WELDING VOLTAGE AND/OR CURRENT TOO LOW B. EXCESSIVE ELECTRODE EXTENSION C. INCREASE INDUCTANCE D. WRONG POLARITY, SHOULD BE DCRP E. WELD JOINT TOO NARROW Table 10-1 – Weld Troubleshooting, (cont’d.)