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北仑港发电厂二号炉在进行气压试验时,有一处汽包上升管接座角焊缝上出现了裂纹,经检查,该裂纹位于沿焊缝圆弧与汽包壁熔合区的边缘处,其表面可见部分弧长约为150mm,宽约1mm,焊接详图及裂纹位置分别见图1～3.管接座规格为φ127mm×11mm,材质为SA210,汽包壁厚为197mm,材质为SA299.为确保质量,决定对其它类型管接座角焊缝进行全面的检验、包括上升管和饱和蒸汽引出管,即对所有焊缝实施100%的磁粉探伤,对总接头数30%的焊口实施超声检测,现就磁粉探伤作一技术分析.1 裂纹产生原因的初步分析裂纹刚好位于沿焊缝圆弧与母材(即汽包壁)的熔合区边缘处,由于裂纹开口较大且长度较长,气压试验时此处产生气啸声,已断定该裂纹属贯穿性裂纹.开口靠近表面的裂纹面上发现金属色不连续,为
Beilun Port Power Station No. 2 furnace in the pressure test, there is a steam drum riser fillet weld cracks appear, after inspection, the crack is located along the weld arc and the edge of the fuselage fusion zone, Its surface can be seen part of the arc length of about 150mm, width of about 1mm, the welding details and crack locations are shown in Figure 1 ~ 3. Tube seat specifications φ127mm × 11mm, material SA210, drum thickness of 197mm, made of SA299 To ensure quality, it was decided to conduct a complete inspection of other types of corner fillet welds, including risers and saturated steam outlets, ie 100% magnetic particle inspection of all welds and 30% The implementation of ultrasonic testing, a magnetic analysis of a technical analysis.1 Preliminary analysis of the causes of cracks Cracks just located along the weld arc and base metal (ie drum wall) at the edge of the fusion zone, due to the larger crack opening and length Long, pneumatic test where the air whistling sound, it has been concluded that the crack is a through cracks, the surface of the crack near the surface of the metal color is not continuous, as