Method and apparatus for heat treating welded joints
专利汇可以提供Method and apparatus for heat treating welded joints专利检索，专利查询，专利分析的服务。并且A series of torches mounted on a single traveling carrier and spaced apart in sequence are passed along a newly welded joint such as a girth joint in a pipeline to heat the metal and relieve high hardness commonly found in the zone adjacent deposited weld metal. The invention is used especially to relieve heat induced stresses in electric arc welding of large work pieces, such as thick walled pipes. Acetylene or other high energy fuel is supplied at a closely controlled rate to each torch. All torches are carried along the joint in a group at a predetermined and controlled rate. Spacing between each torch and the work is carefully adjusted and maintained to control the sequential heat inputs into the interior of the work metal. The first torch applies high intensity heat preferably directly on the weld with succeeding torches apply progressively softer flames. The critical area along the weld thus is quickly brought to austenitic temperature range, followed by slower heating and then by slow cooling, to relieve stress and/or to correct grain growth and related crystalline conditions in the metal. A series of four torches attached to a self-propelled and track-guided carrier are preferred. Since the torches are spaced progressively farther and farther from the work surface, the breadth of heat application by successive torches is progressively widened while heat intensity is reduced. At all times the surface temperature remains within tolerance limits.，下面是Method and apparatus for heat treating welded joints专利的具体信息内容。
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