针对太阳能保温水箱新材料SUS444(00Cr18Mo2)内胆A焊缝的焊接问题,采用了手工钨极氩弧焊,科学选择ER316L作为填充焊丝,重点防范焊接污染及尽可能采用小线能量、小规范施焊,不仅解决了A焊缝焊接的晶间腐蚀和脆化问题,而且很好满足内胆耐腐蚀、保温效果好的要求,保持水箱水质清洁。 Aiming at the problem of the welding of liner A weld of SUS444 (00Cr18Mo2), a new material for solar thermal water tank, manual TIG welding was adopted. ER316L was selected as filler wire scientifically to prevent welding pollution and minimize the use of small line energy. Welding not only solves the problem of intergranular corrosion and embrittlement of A welding seam, but also meets the requirement of good corrosion resistance and thermal insulation of the liner to keep the water quality of the tank clean.