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对接板的TIG封底焊本文研究了TIG封底焊时坡口间隙对背面成形的影响,点固焊缝长度和间隔的确定,焊丝成份对背面成形的影响,TIG立焊背面成形的工艺措施等。试验表明,坡口间隙在2.5～4.0毫米之间,可以满足DIN8563要求的背面成形;间隙小于2.2或大于4.5毫米,则背面易出现凹陷、咬边或加强高过高等缺陷。以TIG焊速100毫米/分计,确定了点固焊缝间隔最小长度为150毫米。点固焊缝最小长度为20毫米。通过焊丝SG2与H10Mn2的对比试验可看出,因SG2含有比H10Mn2高10倍的硅(0.7％),背面成形优良。相反,H10Mn2焊丝的背面没有渣,表面氧化、咬边严重。TIG立焊时背面往往凹陷、咬边严重。试验发现背面加盖板充氩即可解决这个问题。盖板中央有一条4×20毫米的沟槽,充氩流量2升/分,就可得到满
TIG bottom welding of butt joint plate This paper studies the influence of groove clearance on the back forming of TIG back welding, the length and spacing of point welding seam, the influence of welding wire composition on the back molding, the technical measures of TIG welding back forming. Tests show that the bevel gap between 2.5 ~ 4.0 mm, can meet the requirements of DIN8563 back forming; gap is less than 2.2 or more than 4.5 mm, then the back prone to depression, undercut or to strengthen the high and other defects. At a TIG welding speed of 100 mm / min, the minimum length of the point weld was determined to be 150 mm. Point solid welding minimum length of 20 mm. The comparative test of welding wires SG2 and H10Mn2 shows that SG2 contains silicon (0.7%) 10 times higher than H10Mn2 and has excellent backside forming. In contrast, there is no residue on the back of H10Mn2 wire, the surface is oxidized and the undercut is serious. TIG vertical welding when the back is often recessed, undercut serious. Test found that the back of the plate plus argon can solve this problem. The center of the cover has a 4 × 20 mm groove, argon flow rate of 2 liters / min, you can get full