Fiber laser fusion welding of two applicable alloys including 308 stainless steel and low carbon steel (St 37) was performed to assess the formation mechanism of the weld bead and temperature field near the fusion zone. In this research, some parameters including welding speed, laser power, nozzle distance, and beam deviation of the laser beam were determined as the main parameters. The results showed that the effect of the nozzle distance on the temperature field was higher than that of the welding speed and laser power. It was also observed that increasing the nozzle distance caused more absorption of the beam in the parts and there was an almost two-fold increase in the dimensions and volume of the weld bead. The measured temperature near melt pool was decreased about 120 °C for st37 while a reduction about 30 °C for stainless steel according to increasing nozzle distance from 3 to 7 mm. Unlike carbon steel, the temperature of the stainless steel was clearly decreased at the nozzle distance to the highest point. By increasing the welding speed, the temperature around the molten area was decreased. The beam deflection parameter showed the effect of the temperature gradient index on changes and a temperature decrease was observed by creating a distance from the location of thermocouples. Increasing laser power from 300 to 400 W created wider weld bead about 40% and higher temperature about 40 °C for stainless steel in comparison to st37.

对包括308不锈钢和低碳钢（St 37）在内的两种适用合金进行了光纤激光熔焊，以评估焊缝的形成机理和熔合区附近的温度场。在这项研究中，确定一些参数，包括焊接速度，激光功率，喷嘴距离和激光束的光束偏差作为主要参数。结果表明，喷嘴距离对温度场的影响高于焊接速度和激光功率。还观察到，增加喷嘴距离会导致零件中光束的吸收更多，并且焊缝的尺寸和体积几乎增加了两倍。随着喷嘴距离从3 mm增加到7 mm，st37熔池附近的测得温度降低了约120°C，而不锈钢降低了约30°C。与碳钢不同，在喷嘴距离到最高点时，不锈钢的温度明显降低。通过提高焊接速度，降低了熔融区域周围的温度。束偏转参数显示了温度梯度指数对变化的影响，并通过与热电偶位置之间的距离来观察温度下降。与st37相比，激光功率从300 W增加到400 W产生了更宽的焊道，并且不锈钢的温度上升了约40°C。在喷嘴距离到最高点时，不锈钢的温度明显降低。通过提高焊接速度，降低了熔融区域周围的温度。束偏转参数显示了温度梯度指数对变化的影响，并通过与热电偶位置之间的距离来观察温度下降。与st37相比，激光功率从300 W增加到400 W产生了更宽的焊道，并且不锈钢的温度上升了约40°C。在喷嘴距离到最高点时，不锈钢的温度明显降低。通过提高焊接速度，降低了熔融区域周围的温度。束偏转参数显示了温度梯度指数对变化的影响，并通过与热电偶位置之间的距离来观察温度下降。与st37相比，激光功率从300 W增加到400 W产生了更宽的焊道，并且不锈钢的温度上升了约40°C。束偏转参数显示了温度梯度指数对变化的影响，并通过与热电偶位置之间的距离来观察温度下降。与st37相比，激光功率从300 W增加到400 W产生了更宽的焊道，并且不锈钢的温度上升了约40°C。束偏转参数显示了温度梯度指数对变化的影响，并通过与热电偶位置之间的距离来观察温度下降。与st37相比，激光功率从300 W增加到400 W产生了更宽的焊道，并且不锈钢的温度上升了约40°C。