旋挖钻机桅杆用16Mn碳素结构钢的双丝埋弧焊接工艺研究

发布时间：2018-06-22 19:38

本文选题：Mn + 桅杆　；参考：《热加工工艺》2017年23期

【摘要】：采用双丝埋弧焊接工艺对旋转钻机桅杆用16Mn碳素结构钢进行了不同焊接电流、焊丝间距和焊接速度的焊接试验。研究了焊接参数对焊接接头硬度、力学性能和显微组织的影响,得到了适宜的焊接工艺参数,并提出了焊接过程的质量控制措施。结果表明,随着焊接电流的减小,焊接接头热影响区的显微硬度降低,而焊缝区的显微硬度却逐渐升高;不同焊丝间距下显微硬度峰值都在焊接热影响区,焊丝间距对焊接接头显微硬度影响不大;不同焊接速度下焊接接头焊缝区的显微硬度都要高于母材或与母材相当,热影响区的显微硬度要高于母材和焊缝区。焊缝热影响区组织为针状铁素体、片状先共析铁素体、珠光体。焊接电流为700 A、焊接速度为0.0083 m/s、焊丝间距为0.07 m时焊接接头可以获得最佳的强度和塑性,断裂位置位于母材。
[Abstract]:The welding current, wire spacing and welding speed of 16mn carbon structural steel used in the mast of rotary drilling machine were tested by double wire submerged arc welding (saw) technology. The effects of welding parameters on hardness, mechanical properties and microstructure of welded joints were studied. Appropriate welding process parameters were obtained, and the quality control measures for welding process were put forward. The results show that with the decrease of welding current, the microhardness of the HAZ decreases, while the microhardness of the weld increases gradually, and the peak value of microhardness is found in the HAZ at different wire spacing. The microhardness of weld zone is higher than or equal to that of base metal, and the microhardness of heat affected zone is higher than that of base metal and weld zone. The microstructure of the HAZ is acicular ferrite, lamellar proeutectoid ferrite and pearlite. When the welding current is 700A, the welding speed is 0.0083 m / s and the wire spacing is 0.07 m, the best strength and plasticity can be obtained, and the fracture position is located in the base metal.
【作者单位】：西京学院;长安大学工程机械学院;
【分类号】：TG445

【相似文献】