AN IMPROVED METHOD OF SHIELDED METAL-ARC WELDING OR GAS SHIELDED METAL-ARC WELDING RESULTING IN THE REDUCTION OF HYDROGEN PICK-UP IN WELDMENTS AND WELDMENTS OBTAINED THEREBY

摘要

An improved method of shielded metal-arc welding or gas shielded metal-arc welding resulting in the reduction of hydrogen pick-up in weldments, the improvement being that an active gas such as Freon-12 is supplied to the molten weld-pool along with the shielding gas, the active gas being capable of dissociating into its elements at the temperature of the molten weldpool and forming stable compounds with hydrogen which compounds are insoluble in the molten weld pool thereby reducing entry and dissolution of hydrogen in the molten weldpool and presence of hydrogen in the weldments.