镍201板对接焊接技术

摘要

Ni201 is welded by manual argon tungsten arc welding,and ERNi-1 wire with the same chemical composition and the same strength grade as that of Ni201 is selected as the welding material.The physical properties of Ni201 are characterized by low thermal conductivity,high expansion coefficient and poor weld fluid,use large V-shaped groove,groove angle of 70° in the butt welding.In the welding process,adopt small welding line energy and short arc welding,layer temperature is less than 100 ℃.After welding,a series of tests have been carried out,which mainly include nondestructive testing,mechanical property testing and micro metallographic examination.The results show that all kinds of performance indexes meet the requirements of the standard with reasonable welding technology.%采用手工钨极氩弧焊对镍201进行焊接,焊接材料选取化学成分与镍201基本相同、强度级别相当的川RNi-1焊丝镍201的物理性能特点是热导率低、膨胀系数高以及焊缝金属流动性差,在对接焊时应采用更大的V型坡口、坡口角度70.焊接过程中采用小的焊接线能量、短电弧焊接,层间温度小于100℃焊接完成后进行一系列检测,主要有无损捡测、力学性能检测和微观金相检测结果表明,采用合理的焊接工艺,各项性能指标均满足标准要求.