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一、前言有关材料可焊性的研究可分为解决眼前实际生产问题和从长远目标出发研究热裂纹的机理两种研究办法。前者是直接解决产品的可焊性问题,后者是以确定焊缝中各种缺陷形成的机理作为根本的目的。用于评定材料热裂纹敏感性而研制出来的可变拘束技术现已证明:无论对于解决眼前实际生产问题还是研究热裂纹的机理方面均显示了具有独特的功效。二、可变拘束技术简略地说,本试验是利用一个如图1所示的悬臂式小型试样,从左向右熔敷焊缝。当电弧流过“A”点时,气力传动机构突然
I. Preface The research on solderability of materials can be divided into two research methods to solve the actual production problems in the immediate area and to study the mechanism of hot cracks from the long-term goal. The former is a direct solution to product solderability problems, the latter is to determine the formation of various defects in the weld mechanism as the fundamental purpose. The variable confinement technology developed to assess the susceptibility to hot cracking of materials has now demonstrated that it has unique properties both in terms of solving the immediate problems of actual production and of studying the mechanism of hot cracking. Second, the variable restraint technology Briefly, the test is the use of a small cantilever sample shown in Figure 1, welded weld left to right. When the arc through the “A” point, the pneumatic transmission suddenly