焊接工艺检验cn-en

1. Tack welds 定位焊

When required tack welds shall be applied to retain the components in alignment during welding. The length of the individual tack weld and the frequency of such welds should be specified in the relevant weld procedure specification (WPS) or elsewhere. In joints welded by fully mechanized or automatic processes, the condition for deposition of tack welds shall be

included in the WPS. The tack welds shall be applied in a balanced sequence

to minimize the risk of distortion and maintain good fit-up. Where a tack weld is incorporated in a welded joint, the shape of the tack weld shall be suitable for incorporation into the finished weld and shall only be carried out by approved welders. The tack weld shall be free from cracks and other unpermitted imperfections in the weld deposit and shall be cleaned thoroughly before final welding. Tack welds which have cracked and other imperfections such as cold starts and crater cracks shall be removed prior to welding. All tack welds not incorporated into the final weld shall be removed.

如果需要就必须使用定位焊，使结构件在焊接中保持正确位置。在相应

的焊接说明（WPS ）或其他资料中规定了各定位焊缝的长度及焊点数量。使用全机械化或自动化焊接方法时，必须遵守WPS 中关于定位焊的条件。必须按规定焊接顺序实施定位焊，以减小收缩和能很好组装。

如果定位焊纳入焊接连接中，定位焊的形状必须适合于与最后焊缝的连接（结合）。定位焊必须由认可的焊工来作业。定位焊的焊接金属中必须无裂纹和其他不允许的不均匀性，在最后焊接之前必须彻底清洁。定位焊如有裂纹或其他不均匀性，如冷态（低温）起动和焊口裂纹，在焊接之前必须去除。所有不熔入

最终焊接的定位焊必须去除。

2. Temporary attachments 临时附件

Where the assembly or erection procedure requires the use of temporary

welded attachments, they shall be such that they can be easily removed

without damage to the structure. Consideration shall be given to the location of temporary attachments. The material of attachment and consumables used

shall be compatible with the parent metal. When written weld procedure