低合金钢的埋弧焊的焊缝的组织及性能.doc

低合金钢埋弧焊工艺及焊缝组织研究 摘要: 本文针对进行研究。采用两种焊：，研究了焊接工艺参数对组织的影响。结果表明： on SAW welding procedure of low-alloy steel Abstract: Aiming at the low alloy steel welding performance, welding principle and simple operation and other related technology, how to choose the flux and low alloy submerged arc welding process and weld tissue distribution and characteristics of the study. And analysis of current on weld shaping and the effect of flux type and alkalinity on weld microstructure effects. This experiment uses two kind of welding flux: HJ431 and SJ101, two groups of welding parameters : the current 450A, voltage 28V, current 600A, voltage 32V of fluxes and welding parameters on weld microstructure impact current. Use of metallographic examination, observation the mother material and joint tissue distribution and characteristics. The results showed that: low alloy steel submerged arc welding process, under the same conditions, the HJ431 weld seam formation of more than SJ101 more smooth, forming more beautiful. The sintered flux welding parameter welding current is larger, the weld residual and high penetration depth is increased and the weld width change. Key Words :submerged arc welding; low alloy steel; welding; microstructure 目 录 第一章 绪论 1 1.1 低合金钢的概况 2 1.2 低合金钢的焊接性 2 1.3 低合金钢的焊接工艺 2 1.3.1 焊前准备.....................................................................................................................2 1.3.2 焊接材料的选择........................................................................................................3 1.4 埋弧焊 .........................................................................................................................3 1.5 研究现状及发展 3 第二章 实验过程 4 2.1实验材料及方法 4 2.2 焊接工艺过程 4 2.3组织观察 5 第三章 实验结果及分析 6 3.1显微组织 6 3.2显微组织分析 7 第四章 结论 8 参考文献 9  第一章 绪论 1.1 低合金钢的概况 1.2 低合金钢的焊接性1.3.1焊前准备 1.3.2焊接材料的选择 埋弧焊所用的焊接材料是焊剂和焊丝。焊机的用途是形成熔渣，一方面隔绝空气保护金属不受空气的侵害作用；另一方面起着对熔化金属进行冶金处理的作用即通过冶金反应清除有害杂质和过度有益的合金元素。汉斯的作用是：在焊接时熔化进入熔池，起到填充和合金化的作用，另外，尚未融化的焊丝起到导电的作用。本实验是焊剂使用SJ