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本文对比了匀速(V1)、先匀加速后匀减速(V2)、三角函数(V3)、先匀加速再匀速后匀减速(V4)等四种不同焊炬移动方式下的熔池内部传热传质和元素分布的规律,结果表明:V1方式下的熔池的形状比较规则,而其他三种情况的熔池形状不规则。焊炬移动方式对不同元素在熔池内的分布的影响不同,以Mn元素为例,V1方式的熔池元素含量的最大偏差为1.79%;V2的元素含量在熔池和母材交界处会有一些波动,熔池内Mn元素含量差异最大为5.61%;V3方式下,元素含量波动较为剧烈,Mn元素含量差异最大达到13.23%;V4方式下,熔池内元素分布呈单峰或单谷,在熔池内部元素含量并不均匀。焊炬移动方式对熔池与母材中元素含量的差异也有较大影响,对比四种不同移动方式下的C元素分布发现:V1方式下,整个熔池区域的C元素含量比母材中C元素含量高8.43%,而V2、V3、V4方式下,则分别比母材中C含量高16.40%、12.25%和25.00%。由此可见,V1方式下,熔池内元素含量与母材元素含量相差最小,元素分布更为均匀,焊接性能更加良好。
In this paper, the heat transfer inside the weld pool under four different torch moving modes, such as uniform velocity (V1), uniform velocity after uniform acceleration (V2), trigonometric function (V3) and uniform velocity before uniform velocity Mass transfer and elemental distribution. The results show that the shape of the weld pool in V1 is more regular, while the shape of the weld pool in the other three cases is irregular. The influence of welding torch movement on the distribution of different elements in the molten pool is different. Taking Mn element as an example, the maximum deviation of elemental content in the V1 molten pool is 1.79%. The content of element V2 in the weld pool and base metal will have Some fluctuations, the maximum difference of Mn content in the molten pool was 5.61%; Under V3 mode, the element content fluctuated violently, the maximum difference of Mn content reached 13.23%; Under V4 mode, the elemental distribution in the molten pool showed single peak or single valley, Pool element content is not uniform inside. The movement pattern of welding torch also has a great influence on the difference of elemental content between molten pool and base metal. Comparing the distribution of C element in four different moving modes, the content of C element in the entire molten pool area is higher than that in base metal C Elemental content is 8.43%, while in V2, V3 and V4 modes, they are respectively 16.40%, 12.25% and 25.00% higher than that of base metal. Thus, under the V1 method, the difference between the content of the molten pool element and the content of the base metal element is smallest, the element distribution is more uniform and the welding performance is more favorable.