J422 electrodes are marked with "THJ422". What does TH represent?
J422 is the brand of welding rod GB. As for the TH is the enterprise stipulated grades, the first letter T should be on behalf of the welding electrode (strip of the first letter); second letters H, should be related to the electrode trademark or manufacturer's name.
TH: Tianjin Bridge Welding Materials Group Co. Ltd. manufacturer brands. J: stands for structural steel welding rod. 42: two figures indicate that the minimum value of tensile strength of deposited metal is 42kgf/mm2 (412MPa), and the minimum value of the yield strength of deposited metal is 34kgf/mm2 (430MPa). 2: third digit "2" indicates that the type of coating is titanium calcium type, direct current or AC power supply.
J422 is the brand of welding rod GB. As for the TH is the enterprise stipulated grades, the first letter T should be on behalf of the welding electrode (strip of the first letter); second letters H, should be related to the electrode trademark or manufacturer's name.
