back step welding

例句：

1. 1. The back step welding technique is used to reinforce the structure of the bridge.
   后跟步焊接技术用于加固桥梁的结构。
2. 2. The engineers carefully followed the back step welding procedure to ensure the quality of thework.
   工程师们仔细遵循了后跟步焊接程序，以确保工作的质量。
3. 3. During the construction process, it's important to follow the back step welding guidelines to avoid any potential safety hazards.
   在施工过程中，遵循后跟步焊接指南非常重要，以避免任何潜在的安全风险。