When the bead has cooled on the metal sheet transfer it to a mortar and grind to a fine powder.
当球珠已在金属板上冷却，把它转移到一个研钵里，研磨成细粉。
Sufficient force is required to push the metal sealing surfaces into the washer; too much force will damage the bead surfaces.
要求足够的力量来把金属密封表面推进垫圈，但太大的力量会损伤垫珠表面。
Utilizing the transformation of bead metal can reduce tensile stress directly in the course of welding, even produces compressive stress, to improve the service life of welding structure effectively.
利用焊缝金属组织转变的方法可以在焊接过程中直接降低焊接残余拉伸应力，甚至产生残余压缩应力，有效地提高焊接结构的使用寿命。
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