一、前言 GH140高温合金在航空工业中己经使用了二十多年,板材的钨极氩弧焊、点焊和缝焊均已大量用于航空构件,通过有关发动机火焰筒和加力筒体的生产、使用和维修,其焊接工艺日趋完善。本文仅对点焊和缝焊的常见冶金缺陷、故障和焊接工艺特点加以介绍。 二、点焊和缝焊的常见冶金缺陷 1.焊核周围的局部熔化和胡须组织 焊接时由于温度和应力的作用,在焊核周围容易产生晶界局部熔化。局部熔化区域小,属于晶界熔化;局部熔化区域大,焊核中液态金属在电极压力作用下被挤入,成为胡须组织 I. Introduction GH140 superalloy has been used in the aviation industry for more than twenty years. The TIG welding, spot welding and seam welding of the plates have been widely used in aeronautical components. Through the relevant flame cylinder and cylinder The production, use and maintenance, the welding process is maturing. This article only spot welding and seam welding common metallurgical defects, faults and welding process characteristics are introduced. Second, the common spot welding and seam welding metallurgy defects 1 local melting around the weld core and beard tissue welding temperature and stress due to the role of melting in the grain boundary around the local melting easily occur. The local melting zone is small and belongs to the grain boundary melting. The local melting zone is large. The liquid metal in the weld core is squeezed into the beard tissue under the action of the electrode pressure