c. DC reverse connection and short arc welding shall be adopted.

c. The weld with shallow penetration shall be used to improve the heat dissipation condition so that the low melting point material floats on the weld surface and does not exist in the weld.
d. Welding specifications shall be reasonably selected, and preheating and afterheating shall be adopted to reduce the cooling rate.
e. Adopt reasonable assembly sequence to reduce welding stress.

c. Reduce residual stress to avoid stress concentration.
d. During tempering, avoid the sensitive temperature zone of reheat cracks or shorten the residence time in this temperature zone.

c. Select reasonable welding sequence to reduce welding deformation and welding stress.
d. Conduct hydrogen elimination heat treatment in time after welding