WILLARD
YOU ARE ENCOUNTERING A VERY COMMON PROBLEM WHEN WORKING WITH THE MIG PROCESS ON ANY TYPE OF CORRODED STEEL. IT WOULD BE TO YOUR ADVANTAGE TO UTILIZE THE SMAW (STICK) PROCESS WITH A LOW HYDROGEN ELECTRODE SUCH AS ER7018.THE COMBINATION OF THE CLEANSERS IN THE FLUX AND THE LOW HYDROGEN...
CLIVE
IT APPEARS THAT THE PROBLEM YOU ARE HAVING MAY VERY WELL BE THERMAL SHOCK. REPEATED HEATING AND COOLING WITHOUT GRADUAL AMBIENT TEMPERATURE CHANGE IN THE COOLING MEDIUM CAN CAUSE THIS EFFECT.....ESPECIALLY IN CAST MATERIALS
