A New Type of Welding Joint with Bimetal Welding Line
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2022-09-12
具有双金属焊缝的新型焊接接头
A New Type of Welding Joint with Bimetal Welding Line
技术编号
XN-076
提供单位
长安大学
技术大类
其他技术
联系人
崔高峰
技术类型
其他技术
电话
13022867251
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无
适用范围
新能源与节能
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广西东盟技术转移中心
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技术简要说明根据常规焊接接头中金相组织不均匀的相变机制,澄清了焊接中合金元素定向迁移的扩散机理,提出了采用低碳、低强度、高热导率的缓冲层“包裹”高硬度焊接材料使之与母材完全隔离,形成具有双金属焊缝新型组合结构的焊接接头,为解决高强钢焊接中接头强度匹配和焊接性相互矛盾的问题开辟了新思路。利用焊接过程缓冲层与两侧相邻区域合金元素扩散规律、热传导机理及后续焊道的“二次热处理”综合效应,揭示了缓冲层对焊接界面改变的微观作用机制及可能的宏观效应。缓冲层延寿理论为解决高强钢焊接中金相组织不均匀的基础共性问题提供了参考。实验结果表明:在常幅疲劳载荷条件下,接头最薄弱区域的抗疲劳性能基本达到母材水平。
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Technical Brief DescriptionAccording to the phase change mechanism of non-uniform metallographic structure in conventional welding joints, the diffusion mechanism of directional migration of alloy elements in welding is clarified. It is proposed to "wrap" high-hardness welding materials with a buffer layer of low carbon, low strength and high thermal conductivity to completely isolate the materials from the parent metal, thereby forming a type of welding joint with bimetal welding line. This provides a new way to solve the conflict between joint strength and weldability in high strength steel welding. The micro mechanism for and the possible macro effect of the buffer layer on the change of the welding interface are revealed by applying the diffusion law and heat conduction mechanism between the buffer layer and the alloy elements in the adjacent areas on both sides during the welding process, as well as the comprehensive effect after the "secondary heat treatment" of the subsequent welding bead. The buffer layer life extension theory provides a reference for solving the basic common problems of non-uniform metallographic structure in high-strength steel welding. It is indicated by the experimental results that: Under the condition of constant amplitude fatigue load, the fatigue resistance of the weakest area of a joint is possible to reach the level of the parent metal.
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技术提供方长安大学
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技术主要指标信息主要创新点:具有双金属焊缝新型组合结构的焊接接头,为解决高强钢焊接中接头强度匹配和焊接性相互矛盾的问题开辟了新思路。推广应用前景:《中国制造2025》明确将高端装备创新工程作为五大工程之一,强调核心基础零部件等工业基础能力薄弱是制约我国制造业创新发展和质量提升的症结所在,要求“针对制约制造业发展的瓶颈和薄弱环节,着力解决影响核心基础零部件产品质量和稳定性的关键共性技术,加强可靠性设计”。高强合金焊接结构中接头的非均质性强、抗疲劳性能下降严重,致使服役过程中损伤失效绝大部分发生在接头非均质区,成为高强焊接结构的薄弱环节,严重制约了焊接结构设备质量、可靠性和疲劳寿命的提升。
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