Low carbon steel: low carbon content, no hardening tendency, good plasticity, need to take special process welding, heat treatment after welding and need for a variety of welding methods.
But still should be noted: welded joints, etc. should ensure strong welding should not have more than the standard prescribed pores, slag and other defects, which are associated with operations related to the carbon content of the weld metal is usually lower than the base metal, may be increased Si, Mn to ensure the strength of the weld. When the high carbon content, more than 0.24%, it is necessary attention to prevent cold cracking in weld hot cracking and after welding. Some foreign carbon steels up to about 0.30%, which can not but attract attention, when welding these steels, should be properly warmed up. Large thickness of the structure at the time of welding, especially the first backing weld steel without preheating may crack. When this crack will produce iron ore plastic welding electrode thickness exceeds the fillet weld joint of 12mm, with a low hydrogen electrode welding thicker than 32mm of 500MPa strength steel fillet weld, the weld also had micro cracks. This will reduce the weld metal notch toughness and elongation, but had no effect on tensile strength.
Post time: Aug-18-2021