Submerged arc welding current pulse control circuit

Abstract

The invention provides a submerged arc welding current pulse control circuit, comprising a multivibrator circuit, an analogue switch circuit, and three operation amplifiers U3A, U3D and U3C, wherein the multivibrator circuit is connected with the analogue switch circuit; a signal of the analogue switch circuit passes by the operation amplifier U3A and is transmitted to the operation amplifier U3D along with an output signal of the operation amplifier U3C; and an output terminal of the operation amplifier U3D is connected with a welding current control part of a welder. During the submerged arc welding process, an output current is a pulse current; and when the welder carries out the submerged arc welding, the pulse current, which is adopted as a welding current, can play the role of increasing penetration, thus being suitable for the occasions in which the required penetration is large while the practical welding current is small.

Description

technical field [0001] The invention relates to the field of welding machines, especially the submerged arc welding technology. Background technique [0002] Submerged arc welding (including submerged arc surfacing and electroslag surfacing, etc.) is an important welding method. Its inherent advantages such as stable welding quality, high welding productivity, no arc and little smoke make it a pressure vessel, The main welding method in the manufacture of important steel structures such as pipe section manufacturing and box beam columns. In recent years, although many new welding methods with high efficiency and high quality have appeared successively, the application field of submerged arc welding has not been affected in any way. Relevant statistics show that submerged arc welding accounts for about 10% of the various fusion welding methods, and has not changed much over the years. The known technology is that the output current is relatively flat during submerged arc we...

AI Technical Summary

Problems solved by technology

Its disadvantage is that the welding current is a relatively stable current, and the melting depth increases with the increase of the welding current. It is not suitable for use in occasions where large melting depth is required and the actual welding current is small.

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