8.5 Dynamic Dilution Behavior of Moving Weld Pools …
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Fig. 8.43 Comparison diagram of the distribution of wire compositions in the weld joint in the
solidification instant with different welding speeds (No. 4, No. 1 and No. 3)
Fig. 8.44 Comparison diagram of the distribution of wire compositions in the weld joint in the
solidification instant with different welding powers (No. 1 and No. 2)
the principle of mass conservation, at this moment the content of wire compositions
on the upper part of the weld joint tends to decline.
The influence rule of laser power and welding speed on the wire compositions in
the weld joint discussed above can be concluded as the influence of heat input on the
wire compositions in the weld joint. Based on the discussion above, the following
conclusions can be drawn preliminarily: ➀ Raising weld heat input will facilitate the
permeation of wire compositions to the bottom of the weld joint, and increase the
content of wire compositions in the middle and lower parts of the weld joint, thus
relatively reducing the content of wire compositions in the middle and upper parts
of the weld joint; ➁ Reducing heat input will reduce the recoil pressure, and can
effectively reduce the content of wire compositions in the middle and lower parts