This is because when the increase in pulse width

 This is because when the increase in pulse width, pulse energy increases, the weld heat affected zone width increase. 1 # 2 #, 10ms

12ms Figure 3.13 cross-section of welded joints # 14ms 3.2.3 weld of Figure 3.14 is the welding voltage of 260V, pulse frequency of 20Hz, the welding speed is 300mm/min, the pulse width of 10ms.

12m and 14ms when the weld. 
Pulse width of 12ms, the hardness changes in the the M170P side of the heat affected zone is steeper because the M170P side of the heat-affected zone of martensite distribution concentrated in the

pulse width of 12ms. Welding speed and laser welding, the weld microstructure and properties of different thickness Tailored Blanks, you can use the energy of the line to describe the workpiece to

the laser radiation energy situation. The line energy is defined as: the laser energy per unit length of weld acceptance. Welding speed large, the energy of the welding line, penetration decline;

can get greater penetration. Lower welding speed range, with the welding speed increases, the penetration depth significantly reduced. Welding speed, the following variables welding experiments.

This kind of green laser pointer is very practical.
Welded joint cross-section morphology of the welding speed change from the figure can be seen 300mm/min and 400mm/min when, welded joints in the welding speed of forming good, When the welding

speed 500mm/min welded joints uneven thickness of the transition, the seam on the back to sag. The weld heat affected zone width decreases with the increase of welding speed, the width of the seam

on the back is also reduced.The focus is the important performance of laser pointer indeed.
The weld metal ferrite, ferrite distributed point-like carbides, coarse columnar grains close to the base metal heat affected zone of weld, the weld center organization small equiaxed grains. This

is because close to the base metal heat affected zone of the molten pool of metal, base metal particle nucleation, the temperature gradient in the negative cooling, the rapid growth along the

cooling direction, the grain formation of coarse columnar grain; due to the bath the center of the liquid metal temperature above the temperature of solid phase, and far from the border, the

undercooling is small, making the slow growth of crystals within the liquid metal, so the grain in the center of the weld location for small equiaxed grains. Welding speed of 400mm/min weld the

organization of the same ferrite, and the location of the center of the weld fine grain size. For example, if the power of laser pointer is 50mW and at this time the laser pointer can not light the

match or black material.