1) in a welding cycle can be welded at the same time the number of solder joints. Not only high productivity, and no shunt. In the narrow parts of the layout of the solder joints without the dot pitch limit. 2) Since the set of current density in the bump. The current density, it can be smaller current welding, and can reliably the formation of smaller nugget. Corresponds to a certain thickness, spot welding, to form a nugget less than a certain size, it is very difficult. 3) the location of the bump is accurate, the same size, the strength of the points is uniform. Therefore, for a given intensity, the size of the Welding Electrodes Manufacturer solder joints less than Welding Consumables. 4) As a result of the large planar electrode, and the bump is set in a workpiece, so to minimize the other artifacts exposed on the surface of the indentation. Planar electrode of the current density, good heat dissipation, the electrode wear much smaller than the spot, thus greatly reducing the electrode maintenance and repair costs. 5) compared with spot welding, the surface oil, rust, oxide coatings and other coatings on projection welding, but the clean surface can still get a more stable quality.