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测试一下自己的翻译能力吧，对于翻译突出的有奖励！What is Preheat?Preheating involves heating the base [I]meta[/I]l, either in its entirety or just the region surrounding the joint, to a specific desired temperature, called the preheat temperature, prior to welding, Heating may be continued during the welding process, but frequently the heat from welding is sufficient to maintain the desired temperature without a continuation of the external heat source. The interpass temperature, defined as the temperature between the first and last welding passes, can not fall below the preheat temperature, Interpass temperature will not be discussed further here; however, it will be the subject of a future column. Preheating can produce many beneficial effects; however, without a working knowledge of the fundamentals involved one risks wasting money, or even worse, degrading the integrity of the weldment.
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发表于 2021-11-17 18:07:49
