Annex XI of AWS D1.1-96 provides guidelines for alternative methods of determining proper amounts of preheat: the HAZ hardness control method, or the hydrogen control method.

• 附件十一的自动气象站d1.；1 - 96提供了指导方针替代方法确定适当数额的预热：哈兹硬度控制方法，或氢的控制方法。