The temperature fields in laser ＋ GMAW-P hybrid welding for different laser-wire distances in quasi-steady state were calculated using an developed combined heat source model, and the influence of laser-wire distance...The temperature fields in laser ＋ GMAW-P hybrid welding for different laser-wire distances in quasi-steady state were calculated using an developed combined heat source model, and the influence of laser-wire distance on them was analyzed. The results show tbat, at a low level of arc power, the temperature profiles caused by laser and arc energy respecively cannot couple well when the laser-wire distance reaches 4 mm, a trend of separation between them beginning to take place. In the case of high arc power, both the critical laser-wire distance and HAZ width increase.展开更多
In laser ＋ P-GMA hybrid welding, laser-wire distance is an important parameter to describe the distance from laser spot to the center of the pulsed gas metal arc. The experiments results show that the optimal laser-w...In laser ＋ P-GMA hybrid welding, laser-wire distance is an important parameter to describe the distance from laser spot to the center of the pulsed gas metal arc. The experiments results show that the optimal laser-wire distance with the deepest weld penetration increases with welding current and laser power being increased and decreases with welding speed being increased. Welding current, laser power and welding speed determine the hybrid welding heat input in laser ＋ arc hybrid welding process, so there is a correlation between the optimal laser-wire distanee and the hybrid heat input welding parameters for the deepest weld penetration： the optimal laser-wire distance increases with the heat input being increased. The positive correlation between the optimal laser-wire distance and the hybrid welding heat input is induced by the characteristics of the limited influence of P-GMA welding process on laser transmission and the dependence of weld penetration of hybrid welding on laser power.展开更多
以φ1.2 mm TC4钛合金焊丝为原材料,通过激光同轴送丝增材制造技术,结合蛇形正交路径,系统研究了增材试件在不同方向和高度下的力学性能、截面形貌、晶粒度和晶粒取向等之间的联系。研究结果表明,优化工艺参数下,试件表面成形良好(银白...以φ1.2 mm TC4钛合金焊丝为原材料,通过激光同轴送丝增材制造技术,结合蛇形正交路径,系统研究了增材试件在不同方向和高度下的力学性能、截面形貌、晶粒度和晶粒取向等之间的联系。研究结果表明,优化工艺参数下,试件表面成形良好(银白色、无飞溅),内部无气孔、裂纹等缺陷(满足NB/T 47014.2—2015 I级要求)。微观组织分析显示,增材试样底部因多次热循环形成细小网篮组织,中上部的双态组织和魏氏组织特征更为明显。晶粒取向差随高度增加而减小(底部X/Y向分别为45.9°/43.1°,顶部降至37.8°/35.9°)。力学性能测试表明,横向与纵向的抗拉强度(差异2.57%)、断后伸长率(差异4.44%)及冲击韧性(52.6 J和55.3 J)均满足CCS《材料焊接与规范2023》中对TC4板材的要求。此外,由于增材过程中热循环的影响,下层沉积组织晶粒尺寸较小,硬度较高。增材试件在横向和纵向的晶粒度、晶粒取向和组织形态相近,力学性能的各向异性较小。本研究为TC4钛合金激光同轴送丝增材制造技术的工程化应用提供了重要的实验依据。展开更多
文摘The temperature fields in laser ＋ GMAW-P hybrid welding for different laser-wire distances in quasi-steady state were calculated using an developed combined heat source model, and the influence of laser-wire distance on them was analyzed. The results show tbat, at a low level of arc power, the temperature profiles caused by laser and arc energy respecively cannot couple well when the laser-wire distance reaches 4 mm, a trend of separation between them beginning to take place. In the case of high arc power, both the critical laser-wire distance and HAZ width increase.
基金Supported by the key project of Natural Science Foundation of Heilongjiang Province （ZJG0601 and the National Key Technologies Research and Development Program of China during the 11^th Five-Year Plan Period （2006BAFO4B10）.
文摘In laser ＋ P-GMA hybrid welding, laser-wire distance is an important parameter to describe the distance from laser spot to the center of the pulsed gas metal arc. The experiments results show that the optimal laser-wire distance with the deepest weld penetration increases with welding current and laser power being increased and decreases with welding speed being increased. Welding current, laser power and welding speed determine the hybrid welding heat input in laser ＋ arc hybrid welding process, so there is a correlation between the optimal laser-wire distanee and the hybrid heat input welding parameters for the deepest weld penetration： the optimal laser-wire distance increases with the heat input being increased. The positive correlation between the optimal laser-wire distance and the hybrid welding heat input is induced by the characteristics of the limited influence of P-GMA welding process on laser transmission and the dependence of weld penetration of hybrid welding on laser power.
