Features of automatic submerged arc welding
1. Advantages:
(1) High productivity (5-10 times higher than electrode arc welding) ①High current (up to 1000A or more) welding is allowed; ②Flux and slag have heat insulation effect, and the heat energy utilization rate is high, so it can be switched on or not switched on. Groove; ③Saving labor and materials, and high utilization rate of welding wire; ④The amount of flux is small and cheap.
(2) The welding quality is high and the effect of stable protection is good, and the welding specification can be automatically controlled and adjusted.
(3) Good working conditions, no arcs, no splashes, and light labor intensity.
2. Disadvantages
(1) It is mainly suitable for flat welding, but not suitable for welding seams in the welding space.
(2) It is difficult to be used for welding Al, Ti and other metals and alloys with strong oxidizing properties. The flux composition is mainly MnO, SiO2 and other metal and non-metal oxides.
(3) Only suitable for long straight welds and large diameter (φ>500mm) circular welds.
(4) It is not suitable for welding thin plates with a thickness of less than 1mm. Because of its large current and low current, the arc stability is not good.
(5) The equipment is complex, the one-time investment is large, and the requirements for the preparation work before welding are strict.
Application of submerged arc welding
Mainly used for welding various steel structures. Weldable steel types include carbon structural steel, low-alloy structural steel, stainless steel, heat-resistant steel and its composite steel, etc., and can also be used for surfacing welding of wear-resistant and corrosion-resistant alloys on the surface of the base metal. It is suitable for flat welding of long straight seams of medium and thick plate structures and large diameter circular seams in mass production.
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