It is important to avoid penetration of the cladding by the first welding pass as dilution of nickel and other alloyed elements into the steel weld that can cause excessive hardness and cracking.

• 采用台阶式坡口形式,使基层和复层的焊接截然分开,避免第一道焊缝金属的互熔,是防止上述问题发生的最好措施。