Calculation of carbon equivalent (Ceq)
Ceq=C+Mn/6+Ni/15+Cu/15+Cr/5+Mo/5+V/5
Calculated Ceq=0.49%, greater than 0.45%, it can be seen that the welding performance of Q345 steel is not very good, and strict process measures need to be formulated during welding.
Q345 steel is prone to problems during welding
Hardening tendency of heat affected zone
During the welding cooling process of Q345 steel, the quenching structure-martensite is easily formed in the heat affected zone, which increases the hardness of the near seam area and reduces the plasticity. As a result, cracks occurred after welding.
Cold crack susceptibility
The welding cracks of Q345 steel are mainly cold cracks.
Welding construction process of material Q345 steel
Groove preparation → spot welding → preheating → inner welding → back root cleaning (carbon arc gouging) → outer welding → inner welding → self-inspection/special inspection → post-weld heat treatment → nondestructive inspection (welding Seam quality first-class qualified)
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