我厂30t起重船下支承座系45铸钢件,在粗加工过程中发现数处组织疏松与裂纹。为减少经济损失,采用CO_2气体保护焊进行补焊修复。缺陷位置如下图所示:1处为表面龟状裂纹,裂纹范围40×40mm,深25mm;2处为表面龟状裂纹,裂纹范围40×30mm,深30mm;3、4处为线状裂纹,深20mm;5处为筋板层 I plant 30t lifting the ship bearing 45 steel castings found in the rough process of several organizations loose and cracked. In order to reduce economic losses, CO_2 gas shielded welding repair repair. The location of the defect is shown in the following figure: 1 is a surface tortoise-shaped crack with a crack range of 40 × 40mm and a depth of 25mm; 2 are surface turtle-shaped cracks with a crack range of 40 × 30mm and a depth of 30mm; Depth 20mm; 5 for the rib layer