激光光束熔体部分钢铁核心和后盾金属部分，形成焊缝。
The laser beam melts a portion of the steel core and the segment backing metal, forming a weld.
一旦锥管和被焊接的焊缝下来，他们的位置(再次使用夹具进行了细致的对齐)和焊接在一起，形成身体。
Once the tubes and cones are welded down their seams, they're positioned (again using jigs) in careful alignment and welded together to form the body.
碳扩散的结果是在紧邻熔合界面的焊缝金属一侧形成高硬度的增碳层，母材金属一侧产生硬度较低的贫碳层。
Carbon migration induces the formation of carbon-enriched layer in the austenitic weld metal and carbon-denuded layer in the Cr-Mo steels base metals.
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