2. The welding method is not limited.
3. Properly increase the preheating temperature with a large linear energy, and generally the preheating temperature and interlayer temperature can be controlled between 250 ~ 300℃.
4. Welding materials shall ensure that the composition of deposited metal is basically the same as that of base metal, such as J 107-Cr.
5. Quenching and tempering heat treatment shall be carried out in time after welding. If it is difficult to carry out quenching and tempering treatment in time, intermediate annealing or heat preservation at a temperature higher than preheating can be carried out for a period of time to eliminate hydrogen diffusion and soften the structure. For products with complex structure and many welds, an intermediate annealing can be carried out after welding a certain number of welds.