Micro electric arc welding technology of thin wire coil

Abstract

The invention discloses a micro electric arc welding technology of a thin wire coil. The micro electric arc welding technology comprises the following steps: preparing welding equipment first, and starting a vacuum pump; sucking external air at a porcelain nozzle in the bottom of a welding gun inwards and upwards to form an ascending air current; preheating welding spots, namely aligning an electrode with a copper pin on which an enameled wire is wound, carrying out preheating on welding spots for 10ms-100ms by adopting a 0.3-2A low current, and burning enamel leather on the enameled wire without damaging copper wires on the thin wire coil; fast increasing the welding current to 40A and welding the preheated welding spots for 2-200ms with the welding current of 40A, so that the pin is molten to form a molten globule and a fine wire on which the enamel leather is burnt out is wrapped by the molten globule. In the meantime, high-temperature gas around the porcelain nozzle and the welding region is sucked inwards and upwards by means of the ascending air current so as to protect the enameled wire welded at the connection of the fine wire coil from being burnt to break; an original tin-plated thermoelectric iron is replaced by utilizing the advantages that a copper-tungsten, pure tungsten or tungsten alloy electrode is resistant to high temperature and electric arc erosion, good in electricity conduction and heat conduction properties and high in cooling speed, nitrogen protection gas is prevented from being used for welding in the welding process, and the harm on human body is reduced.

Description

Technical field: [0001] The invention relates to a micro-arc welding process, in particular to a micro-arc welding process for thin wire coils. Background technique: [0002] Micro-arc welding machine is a kind of argon arc welding machine that can precisely control welding energy. Its output current is DC. At present, foreign products can stably control the current in the range of 0.25A to 100A, and the welding time can be accurate to 0.1ms; conventional Both argon arc welding and micro-arc welding require shielding gas to protect the welding area. Nitrogen is usually used. When the oxygen concentration in the air in the workplace is lower than 18%, it will cause harm to the human body. You must wear an air respirator and a safety protective mask. Welding, when welding coils, a lot of shielding gas will be consumed in the process of welding with shielding gas, and a special channel is required to discharge the shielding gas, thus increasing the operating cost of the enterpr...

AI Technical Summary

Problems solved by technology

[0002] Micro-arc welding machine is a kind of argon arc welding machine that can precisely control welding energy. Its output current is DC. At present, foreign products can stably control the current in the range of 0.25A to 100A, and the welding time can be accurate to 0.1ms; conventional Both argon arc welding and micro-arc welding require shielding gas to protect the welding area. Nitrogen is usually used. When the oxygen concentration in the air in the workplace is lower than 18%, it will cause harm to the human body. You must wear an air respirator and a safety protective mask. Welding, when welding coils, a lot of shielding gas will be consumed in the process of welding with shielding gas, and a special channel is required to discharge the shielding gas, thus increasing the operating cost of the enterprise; moreover, the downward jet of air will make the high-temperature gas downward, in When welding thin wire coils, it is easy to burn the wires at the joints. At present, the welding of fine wires has always been a difficult problem in the coil industry.

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