The main region of invalidation of the weld joint between different steels is commonly in fusion zone during welding or serving.
异种钢焊接接头在焊接时或使用期间，发生失效的主要区域通常在熔合区。
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。
The appearence characteristics of the heterogenous mixture zone near the bottom of weld metal in the fusion welded joint are studied through metallographic observations of many fusion welded joints.
通过时大量熔化焊接头的金相观察，研究了熔化焊接头焊缝底部附近“不均匀混合区”的形貌特征。
The paper studies the fatigue failure probabilistic model of the weld zone in welded joint using probabilistic fracture mechanics and reliabilitistic analysis methods.
本文采用概率断裂力学方法和可靠性分析方法，针对压力容器焊接接头的组织不均匀特点，研究了焊缝区疲劳失效概率模型。
The results show that the TIG weld joint of ZM5 magnesium alloy is composed of heat affected zone, partially melted zone and weld metal.
结果表明：ZM5合金TIG焊接接头是由热影响区、部分重熔区和焊缝组成。
The result shows that the fracture mode is low stress brittle fracture. The fracture is mainly caused by needle type martensite in the heat affected zone of the weld joint.
结果表明，在连接杆焊缝附近的热影响区中存在大量针状马氏体组织，在低应力的作用下，导致材料发生脆性断裂。
The weld zone is the weakest in welded joint due to effects of chemical components of filler and crystallization process.
因焊丝合金化学成分和结晶过程的影响，焊缝处是合金接头的薄弱环节。
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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