leftward welding

例句：

1. 1. The leftward welding process is crucial for the structural integrity of the bridge.
   左向焊接过程对于桥梁的结构完整性至关重要。
2. 2. The engineers carefully monitored the leftward welding to ensure the quality of thejoints.
   工程师们仔细监控了左向焊接，以确保接头的质量。
3. 3. During the construction, the workers performed leftward welding on the steel beams to reinforcethem.
   在施工过程中，工人们对钢梁进行了左向焊接以增强其强度。