(9) In order to prevent internal stress caused by welding, under normal circumstances do not allow the site to the sieve box and any auxiliary parts for welding, must be welded, the operator should be skilled personnel. Recommended the following steps.
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If the valve body material can be welded, but very different thermal expansion coefficient, or changes in operating temperature range of a larger thread junction closure weld must be honey.
如果阀体的材料是可以焊接的，但膨胀系数差异很大，或者工作温度的变化幅度范围较大，螺纹连接部必须进行蜜封焊。
Just because your car is constructed of welded metal parts doesn't mean that you must be skilled with a welding torch to drive it.
虽然汽车是由金属部件焊接构成，但并不意味着你必须熟练掌握焊接技术才能开车。
A good electrical connection to the material to be welded must be established.
一个良好的电气连接并焊接材料必须建立。
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