摘要
对热水器内胆进行水压测试时,水管环焊缝周边开裂是导致产品不合格的主要因素,给企业带来较大损失。以某品牌热水器内胆为研究对象,借助扫描电镜、金相显微镜和宏观观察等检测手段探讨并分析出现水压开裂的原因。研究表明,热影响区在焊接前受到塑性变形,易形成应力集中,存在摩尔形变储存能Es,在受到焊接热输入时,该处晶粒易发生再结晶并逐渐长大,形成粗大晶粒,导致水压测试时焊缝出现裂缝甚至断裂。
When carrying out a water pressure test on a water tank,tile cracks around the welds are the main factor that make it unqualified,which causes huge lost to a company. A certain water heater tank is selected as the sample of study in this paper,through the SEM,metalloseope and macroscopic observation,the reasons of cracks under water pressure are discussed and analyzed. The result shows that the plastic （teformation of heat affected zone occun＇ing before welding can easily causes stress concentration and produces Mole Distortion Energ7 Es,where the grains will easily recrystallize and gradually grow up within the welding heat input,and then big grains are formed ,which causes the cracks even fracture during the water pressure test.
出处
《电焊机》
2017年第5期129-132,共4页
Electric Welding Machine
