Usage and precautions of plasma welder
Generally use 3-10A welding current welding thickness of 0.08-0.6mm thin plate. Because the density of titanium liquid is small and the surface tension is large, the small hole effect of micro-beam plasma welder can be used to weld the titanium liquid and liquid with large thickness in a single channel, so as to ensure that there will be no molten pool collapse and the weld is well formed. Generally, the maximum thickness of the workpiece is not more than 3mm, and because the tungsten electrode is close to the molten pool, tungsten erosion may occur, so that the weld can penetrate into the tungsten inclusion.
Microbeam plasma welding machine is used for welding, its strength is similar to argon arc welding, its strength coefficient is 90%, but the plastic index is 15mm higher than argon arc welding, and the matrix material can be welded to more than 15mm, and the matrix material can be welded to the titanium plate less than 15mm, so that the surface is V-shaped or U-shaped. The weld thickness can be more than 15mm. The welding current of micro-beam plasma welder is less than 30A, and the arc form is joint arc, that is, the maintenance arc and the working arc exist simultaneously. When the weld gap is slightly larger and the weld residual height is insufficient or concave, it indicates that the weld metal is insufficient and the filler wire should be used. The filler wire should be a special wire with the same metal composition as the base metal, or a side strip cut from the base metal can be used.
During welding, do not move the micro-beam plasma welder immediately after the emergence of the transfer arc. The micro-beam welding wire should be kept in the original position until the base metal melts and the molten pool is formed, and then the welding wire is filled and the welding machine is moved. Welding seam and welding nozzle center have high requirements for neutral welding seam. The Small editor of Duowood industry suggests that the deviation should be as small as possible, otherwise it will bias welding or produce edge bite. At the same time, when the arc is extinguished or at the end of the welding process, the micro-beam plasma welder should stay in place for a few seconds to protect the gas to continue to protect the high temperature of the weld, so as not to oxidize. In short, the micro-beam plasma welder has the characteristics of energy concentration, high temperature, fast welding speed, stable arc, weldable materials, good weld quality and so on.
