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.
角焊缝的强度不仅与焊脚尺寸有关，还取决于焊缝金属与母材强度的匹配。
The strength of fillet welding joint is related not only to the fillet weld size, but also depends on the base metal strength matching.
改性沥青各种罐与管道用焊接材料选择的原则是：焊缝金属的性能应高于或等于母材性能。
The principle of choose on welding material of alter-asphalt in every kinds of tanks or tubes is: the character of welding seam metals should be higher than the original welding material.
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