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坡口型式的合理选择低合金钢结构件或厚板焊接时,第一道焊缝往往由于大的拘束应力的作用而产生根部裂缝。除了焊接材料、焊接规范对单道焊裂缝有影响之外,坡口型式对裂缝敏感性也有很大的影响。在实际生产中,常用的坡口型式有y形、x形、单面v形、k形等。坡口型式不同,焊缝根部的应力和变形集中程度也不同。即使相同的坡口型式,钝边厚度不同时,第一道焊缝也不一定就在板厚的中心部位上,焊接时焊缝不
Reasonable choice of groove type When low-alloy steel structures or thick plates are welded, the first weld often causes root cracks due to the large restraining stress. In addition to the welding material, the weld specification has an effect on single-pass welding cracks, the groove type also has a significant impact on the crack sensitivity. In actual production, commonly used groove type y-shaped, x-shaped, single-sided v-shaped, k-shaped and so on. Groove different types of weld root stress and deformation concentration is also different. Even if the same groove type, blunt edge thickness is not the same, the first weld is not necessarily in the central part of the thickness of the weld is not welded