一、缺陷的定义焊缝中的缺陷可以分成两类:1.物理缺陷(或几何缺陷):包括所有众所周知的焊接的缺陷,如裂缝、夹渣、气孔、未熔合等,以及在服役中所产生的缺陷,诸如疲劳裂缝、腐蚀等等.2.冶金缺陷:当化学成份或焊着金属、热影响区的组织不符合要求时就成为冶金缺陷。它们可导致不良的机械、化学、电气性能而使产品达不到符合使用 First, the definition of defects Defects in the weld can be divided into two categories: 1. Physical defects (or geometric defects): including all well-known welding defects such as cracks, slag, porosity, unfused, etc., and in service Defects such as fatigue cracks, corrosion, etc. 2. Metallurgical defects: Metallurgical defects occur when the chemical composition or the structure of the weld metal and heat affected zone does not meet the requirements. They can lead to poor mechanical, chemical and electrical properties that can not meet the requirements of the product