随焊接热输入和激光功率密度的增大，焊缝截面由钉形向近X形转变。
With increase of heat input and laser power density, the cross section of the weld transformed from nail shape to near X shape.
主要研究A105钢小直径焊丝埋弧焊时，电弧电压、焊接电流和焊接热输入对焊缝成形的影响。
The effects of arc voltage, welding current and heat input on the weld appearance in submerged-arc welding(SAW) of A105 steel with small diameter welding wire were experimentally researched.
随着热输入增大，焊缝柱状晶宽度增大，焊缝中针状铁素体板条有粗化的趋势；
With the increasing of heat input, the width of columnar crystal is increased, the dimension of acicular ferrite of weld metal is increased.
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