what is called 4in1 laser welding ?

What is called 4in1 fiber laser welding machine? what is the 4 function?
it is welding,cleaning, handheld cutting and welding seam cleaning. in fact  all handheld laser welding machine can do the seam cleaning, F150 focus lens,setting the welding width wider, reduce the out power .you can see the cleaning effect. see below pictures, it can make the welding seam brighter .
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