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前言用熔化焊的方法将金属焊接起来,一般地说是在局部地区进行电冶金过程,即借助熔融的焊缝金属的结晶凝固,将焊接熔池两侧的被焊金属联结成一个整体。显然,焊接过程是一系列不平衡的物理与化学过程的综合。譬如母材金属被快速度加热到过热高温,随后快速冷却;焊缝金属在冶金反应中被炼制并快速结晶,焊接结构是具有一定刚性的系统,焊接接头在冷却过程中的热收缩将受到拘束作用,而快速加热与快速冷却又将使拘束效应变得更为
Preface The method of welding with molten metal welded together, generally speaking, in some areas for the electrometallurgical process, that is, with the melting of the weld metal crystallization solidification, the weld pool on both sides of the weld metal bonding as a whole. Obviously, the welding process is a combination of a series of unbalanced physical and chemical processes. For example, the base metal is rapidly heated to high temperature and then rapidly cooled. The weld metal is refined and rapidly crystallized in the metallurgical reaction. The welded structure is a rigid system. The thermal contraction of the welded joint during the cooling process will be affected Restraint effect, and rapid heating and rapid cooling in turn will make restraint effect even more