The causes to such defects as cracking and sand inclusion in the integral rear draft lug and the body center plate filler are analyzed, and the technology improvement measures are described.
分析了一体式后从板座及上心盘座裂纹、夹砂等缺陷产生的原因，并介绍了工艺改进措施。
2
The stripe coat must be applied prior to full coat on the erection joints, marker of tanks, water line, draft mark, ship name and port register etc of shell plate.
外壳上的焊缝、舱室标记、水线标记、水尺、船名、港籍名等每一度涂层施工前均要做预涂；
3
The result shows some cracks appearing on vertical weld connecting web plate of body bolster and draft sill as well as the part between web plate of body bolster and top cover plate.