30CrMnSiA搅拌摩擦焊组织及性能研究
Research on Resistance Spot Welding Automation Unit Based on Complex Titanium Alloy Parts
-
摘要: 本文对2mm厚30CrMnSiA高强钢进行了搅拌摩擦焊接，分别对不同热处理状态及不同旋转速度进行了焊接，对焊缝组织及焊缝进行进行了测试，通过观察及测试发现，当搅拌头的旋转速度由250rpm增大至350rpm时，热机械影响区越来越清晰、面积不断增加，焊核区的晶粒数目增加，尺寸减小，组织中的马氏体含量升高，铁素体含量降低；搅拌区动态再结晶速率越快，焊接接头的抗拉强度也由630.8MPa升高至666MPa，而热影响区仅受到热循环的影响而不会发生动态再结晶，晶粒粗大，其往往是焊接接头薄弱之处；热处理工艺能够有效提升母材与焊接接头的抗拉强度。尤其是焊前热处理的过程，能够得到高强度的马氏体组织，且使得在相同条件下这种工艺所得到的焊前晶粒最细小，由此能够在拉伸测试中展现出更高的强度，；而焊后热处理后由于较多含有塑性较好的铁素体，也能够展现出高的抗拉强度，但由于焊前热处理对搅拌头磨损较为严重，建议实际工程生产时采用先热处理再焊接的方式。Abstract: Titanium alloys show great potential for aerospace applications because of their remarkable advantages, and automated resistance welding provides a way to bonding large-scale structures. The research developed a spot welding unit to guarante the stability and repetitiveness in welding process. In this study, we designed the adaptive welded pliers suitable for product welding to ensure the adaptability of the product size, and the position of the welded joints was simulated. The results showed that the product size was suitable, the welding test film of weld forming and performance was excellent.
-
Keywords:
- Titanium alloys /
- Resistance spot weld /
- Automation /
- Microstructure
-
计量
- 文章访问数: 69
- HTML全文浏览量: 0
- PDF下载量: 4
下载:
