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在金属焊接过程中,焊缝熔池金属从熔态冷凝到室温,而焊缝邻近的基体金属则加热到接近于熔化温度;因此在焊缝及其邻近的基体金属中存在着晶粒粗大的魏氏组织,同时在冷却过程中还产生很大的热应力和组织应力,所以重要的焊接构件都要进行热处理,以消除这些缺点。焊接件的热处理通常都是在外热式炉内将工件全部加热,对于大型焊接件就需要异常巨大的加热炉。例如,石油容器焊接以后的热处理,就需要长达20米以上的巨型炉子,燃料的消耗量很多。而且大型构件的装炉、出炉和搬运都很困难,在加热过程中有时还会
During the metal welding process, the weld pool metal is condensed from the molten state to room temperature, and the base metal adjacent to the weld seam is heated to near the melting temperature; therefore, there is a coarse grain in the weld and its adjacent base metal Widman’s organization, at the same time in the cooling process also produces a great deal of thermal stress and tissue stress, so the important welding components must be heat treatment to eliminate these shortcomings. Heat treatment of welded parts are usually heated in an external furnace all the workpiece heating, large welding pieces on the need for unusually large heating furnace. For example, heat treatment after oil tank welding requires giant furnaces of up to 20 meters in length and consumes a lot of fuel. And large components of the furnace, baked and handling are very difficult, sometimes in the heating process will