step by step roller spot welding

例句：

1. 1. The process of stepby step roller spot welding iscrucial for the quality of the final product.
   逐步滚轮点焊的过程对于最终产品的质量至关重要。
2. 2. In this workshop, we willlearn how to perform step by step rollerspot welding on a steel plate.
   在这个工作坊中，我们将学习如何在钢板上进行逐步滚轮点焊。
3. 3. Theengineer explained that the use of step bystep roller spot welding can significantlyreduce the production time and improve efficiency.
   工程师解释说，使用逐步滚轮点焊可以显著减少生产时间并提高效率。