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.

Welding of general order: Preheat rust before welding inspection → → assembly and welding pad and arc board → welding → test
5.3.1 groove angle before welding inspection, blunt edge, gap, and the amount of the wrong mouth, groove and on both sides of the rust, oil, iron skin, etc. should be cleaned.
5.3.2 preheating. Before welding gas welding or specially roasted gun uniform heating of the groove and the base metal on both sides of each of the 100mm range and surface temperature measurement temperature, to prevent the temperature does not meet the requirements or the surface of the partial oxidation, preheat temperature.
5.3.3 Recheck the preheat temperature, if the temperature is not enough should be re-heated to make it meet the requirements.
5.3.4 assembly and welding pad and arc plate, surface cleanliness requirements the same as the surface of the groove, pad and base metal snapping, should be solid arc plate and base metal welding.
5.3.5 Welding Wire China: the first layer of weld bead should seal the junction of the the groove base metal pad, then by trace layer tired solder to fill the groove, After every weld must be removed before welding slag and spatter, weld defects should be promptly rubbed off and repair.
5.3.6 an interface must be continuous welding finished, as a last resort midway stop welding, insulation slow cooling process, the regulations should be re-heated again before Welding Rod

5.3.7 in case of rain, the snow should stop welding, the component weld around and above should have windshield, canopy, wind speed greater than 5m / s should stop welding. Ambient temperature is below zero, should be required to take the measures of preheat and post-heat construction.
5.3.8 carbon structural steel should be cooled to ambient temperature, low-alloy structural weld