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熔合线在变形时效以后韧性要发生很大折损,韧性主要折损在以下几方面:焊接热影响;预拉伸变形;人工时效等。 (1)在各项折损中以预拉伸变形折损最大,约占总折损的50％左右。 (2)焊接热折损与焊接线能量有密切关系。焊接线能量太大、太小都会使热折损增大。在最佳线能量时热折损最小。 (3)总折损与线能量的关系与热折损和线能量的关系非常相似。也有一个最佳线能量。 (4)确定最佳焊接线能量是提高时效韧性的重要途径。合理地确定预拉伸变形量才能合理的利用材料。应根据结构的实际情况,正确的规定预拉神变形量。
Fusion lines in the deformation aging toughness to a great loss, the main loss of toughness in the following aspects: welding heat; pre-stretch deformation; artificial aging. (1) In the various losses in the pre-stretch deformation of the largest loss, accounting for about 50% of the total loss. (2) Welding heat loss and welding line energy are closely related. Welding line energy is too large, too small will increase the thermal damage. Heat loss is minimized at optimum line energy. (3) The relationship between total loss and line energy is very similar to the relationship between heat loss and line energy. There is also a best line energy. (4) to determine the best welding line energy is an important way to improve the toughness of aging. Rationally determine the amount of pre-stretch deformation in order to rational use of materials. Should be based on the actual situation of the structure, the correct pre-Lhashen deformation provisions.