I'm new to forums, so please excuse my lack of etiquette.
I have a customer that is trying to weld an M12 DIN929, 3-Projection Weld Nut to 5/16 low carbon steel. He has not had any success. They have satisfactory results with others - M5, M6, M8, M10 & 1/2-13. They are using a 120kva Press...