Hi guys, have a project where will be welding to flange of existing W 12x190 column. Has a flange thickness of 1 3/4". Will that welding require preheat?
Whether A36, A572-50, or A992, preheat is required. Depending on the welding process and material grade the preheat is 150*-225*. If you are not sure the material grade I suggest the higher preheat/interpass temperature minimum.