Improvement of elongation of joint is related to weaker cool deformation degree of heat affect zone (HAZ) and uniformity of strength and stress level between weld and base metal.
接头延伸率的改善同热影响区冷变形程度的减弱及焊缝强度、应力水平同母材趋于一致有很大关系。
Its results show that with decreasing the relative width of under-matching weld metal, the tensile strength of welding joint increase.
结果表明：随低强焊缝金属相对宽度变小，接头抗拉强度增大；
But the mechanical properties of weld joint have influence on selection of welding technology and welding material, and on strength calculation of construction.
而接头性能直接影响着结构焊接工艺的选择和强度计算。
The strength of fillet welding joint is related not only to the fillet weld size, but also depends on the base metal strength matching.
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。
There is no need to weld the joint thoroughly for the cruciform joint. But if the dimension which is not welded is too large. that will make fatigue strength reduce.
厚板焊接结构的角焊缝，多数情况下没必要完全焊透，但是，如果未焊透部分尺寸过大，就会使焊接接头的疲劳强度大幅度降低。
However, the creep fracture of medium strength match joint, located in the low strength base metal remote from the weld interface, showed a ductile fracture character.
中强匹配接头蠕变断裂位置在远离焊缝界面的低强度母材区，呈延性断裂性质。
The tensile strength of welded joint is significantly improved after heat treatment and the failure occurred far away from the weld metal zone.
焊接接头抗拉强度大幅度提高，断裂均处在远离焊缝的母材上。
The tensile strength of welded joint is significantly improved after heat treatment and the failure occurred far away from the weld metal zone.
焊接接头抗拉强度大幅度提高，断裂均处在远离焊缝的母材上。
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