Heat uniformly, sweeping the flame from the fitting to the tube until the flux on the fitting becomes quiet.
加热要均匀，将火焰从管件扫到管道直到管件上的焊剂变得平静为止。
Heat treatment shall be carried out uniformly over the whole material and never on a part of the material only.
应均匀地对整体材料进行热处理，而不可以仅针对材料的一部分。
Usual practice is to heat the steel to the desired temperature and hold it there only long enough to have it uniformly heated.
通常的做法是将钢加热到所需温度并且仅保温到正好使其均匀受热。
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