The HAZ hardness control method, which is restricted to fillet welds, is based on the assumption that cracking will not occur if the hardness of the HAZ is kept below some critical value.

• 热影响区硬度控制方法，即只限于角焊缝，是基于一个假设，即打击不会再发生，如果硬度的哈兹是低于一些关键的价值。