High-efficiency copper-iron automatic flame brazing machine and brazing method thereof

Abstract

The invention relates to a high-efficiency copper-iron automatic flame brazing machine and a brazing method thereof, in particular to a brazing device for compressor hot rolled plate shell cover and copper pipe girth welding, which comprises a rotary disc, a control system and a flame welding mechanism, wherein the rotary disc comprises a loading station, a sensing station, a preheating station, a welding station, a cooling station and an unloading station; a flame preheating mechanism is installed correspondingly to the preheating station; a temperature sensing device for detecting welding temperature on the welding station is installed correspondingly to the welding station. The automatic flame brazing machine disclosed by the invention overcomes the shortages of the prior art, breaks through the core technology of the flame welding (controlling temperature of the flame), and reduces the dependency of the existing compressor hot rolled plate shell cover and the copper pipe girth welding on the high-silver solder, thereby reducing the brazing cost remarkably.

Description

technical field [0001] The invention relates to a high-efficiency copper-iron automatic flame brazing machine and a welding method thereof, in particular to a brazing device used for welding the hot-rolled shell cover of a compressor and the circumferential seam of a copper pipe. Background technique [0002] In recent years, dissimilar metal brazing applications have become increasingly widespread. However, due to the great difference in the physical and chemical properties of different materials, especially their different thermal expansion coefficients, during the cooling process after welding, the shrinkage of different materials is inconsistent, resulting in deformation stress. If the weld is not strong enough to overcome the deformation stress, it will crack the weld and cause the compressor to leak. [0003] Especially for the welding of air conditioners, refrigerators and other compressor shell covers and copper pipes, in view of the internal pressure of the compres...

AI Technical Summary

Problems solved by technology

In order to solve the problem of welding dissimilar metals between the compressor casing cover and the copper tube, the brazing of the compressor casing cover and the copper tube is brazed with brazing materials containing high silver content (such as BAg40CuZn, BAg45CuZn, etc.), because the silver-based solder is expensive , leading to higher welding costs

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