为保证接头的焊接质量，推荐了纤维素型下向焊条管子全位置焊的焊接规范并详细介绍了操作要领。
To ensure the welding quality of pipe joints this article recommends the welding specifications on pipe's all position with the fiber down-welding electrode and introduces in detail the operation way.
下向焊这种焊接新工艺在国内已广泛用于长输管道的焊接。
A new welding technique on down-welding has been widely used in welding of long distance pipeline.
通过对下向焊焊接工艺和焊口的受力分析，解析出其产生裂纹的原因，提出了相应的防止对策。
The relative Solutions to cracks are given by studying the downhill welding process and cracking stress analysis.
应用推荐