In this study,the effect of welding parameters on the microstructure and mechanical properties of the dissimilar resistance spot welded DP1000–QP1180 joints was investigated.Heat affected zone(HAZ)width of QP1180 sid...In this study,the effect of welding parameters on the microstructure and mechanical properties of the dissimilar resistance spot welded DP1000–QP1180 joints was investigated.Heat affected zone(HAZ)width of QP1180 side was smaller than that of DP1000 side.HAZ width and indentation depth increased with increasing welding current and welding time.The nugget size increased with increasing welding current whereas it increased at lower currents and decreased at higher currents with increasing welding time.The lowest hardness was on the DP1000 side.On the QP1180 side,the center of HAZ had the peak hardness.With increasing welding current,hardness values throughout the weld zone decreased and the tensile shear load increased.At lower welding currents,the welding time did not affect the tensile shear load.Tensile elongation decreased with the increase of welding time,whereas there is no relationship between the welding current and elongation.The spot-welded joints having higher strength exhibited a more ductile fracture characteristic.展开更多
基于COMSOL软件对激光功率、焊接速度对焊缝宽度以及散热条件对焊缝温度分布与焊缝宽度的影响进行了分析,激光功率和焊接速度的大小决定工件接收的能量与加热时间能否使工件熔融,为了达到焊接目的,需要合理选择激光功率,焊接过程中有无...基于COMSOL软件对激光功率、焊接速度对焊缝宽度以及散热条件对焊缝温度分布与焊缝宽度的影响进行了分析,激光功率和焊接速度的大小决定工件接收的能量与加热时间能否使工件熔融,为了达到焊接目的,需要合理选择激光功率,焊接过程中有无铜支承板对应着不同散热条件。仿真结果表明,焊接最佳激光功率1.1 k W,焊接速度8 mm/s;散热条件越好,焊缝周围冷却速度越快,焊接过程中散热越迅速,工件温度分布轮廓越清晰,焊缝宽度越小。展开更多
基金Project supported by Beycelik Gestamp Inc.,Turkey
文摘In this study,the effect of welding parameters on the microstructure and mechanical properties of the dissimilar resistance spot welded DP1000–QP1180 joints was investigated.Heat affected zone(HAZ)width of QP1180 side was smaller than that of DP1000 side.HAZ width and indentation depth increased with increasing welding current and welding time.The nugget size increased with increasing welding current whereas it increased at lower currents and decreased at higher currents with increasing welding time.The lowest hardness was on the DP1000 side.On the QP1180 side,the center of HAZ had the peak hardness.With increasing welding current,hardness values throughout the weld zone decreased and the tensile shear load increased.At lower welding currents,the welding time did not affect the tensile shear load.Tensile elongation decreased with the increase of welding time,whereas there is no relationship between the welding current and elongation.The spot-welded joints having higher strength exhibited a more ductile fracture characteristic.
文摘基于COMSOL软件对激光功率、焊接速度对焊缝宽度以及散热条件对焊缝温度分布与焊缝宽度的影响进行了分析,激光功率和焊接速度的大小决定工件接收的能量与加热时间能否使工件熔融,为了达到焊接目的,需要合理选择激光功率,焊接过程中有无铜支承板对应着不同散热条件。仿真结果表明,焊接最佳激光功率1.1 k W,焊接速度8 mm/s;散热条件越好,焊缝周围冷却速度越快,焊接过程中散热越迅速,工件温度分布轮廓越清晰,焊缝宽度越小。
