Efficient quasi ion arc welding machine

Abstract

The invention discloses an efficient quasi ion arc welding machine which comprises a quasi ion arc welding machine main loop, a PWM control circuit and an IGBT drive circuit. The PWM control circuit periodically sends drive pulse signals, the IGBT drive circuit is driven to output turn-on voltage, an IGBT bridge arm in the quasi ion arc welding machine main loop is turned on, the output current of the quasi ion arc welding machine main loop gradually increases at a gradually-decreasing speed, and finally the peak current is formed. When the PWM control circuit does not send the drive pulse signals, the IGBT drive circuit outputs turn-off voltage, the IGBT bridge arm in the quasi ion arc welding machine main loop is turned off, the output current of the quasi ion arc welding machine main loop is gradually decreased at a gradually-decreasing speed, and finally the base-value current is formed. The arc energy density of the efficient quasi ion arc welding machine is high, arcs are straight and concentrated, the workpiece penetrating power is strong, no grooves need to be formed when thick workpieces are welded, molten pools are deep, formation is perfect, and the machining efficiency is high.

Description

technical field [0001] The invention relates to the field of metal welding equipment, in particular to a high-efficiency quasi-ion arc welding machine. Background technique [0002] TIG argon arc welding machine is widely used in metal processing. The so-called argon arc welding, that is, tungsten inert gas shielded arc welding, refers to the welding method that uses industrial tungsten or active tungsten as non-melting electrode and inert gas (argon) as protection. , referred to as TIG. [0003] Generally, the energy density of the output arc of TIG welding is about 1000W / cm2, and the output arc temperature is also about 5000K-8000K. When welding relatively thin workpieces, the welding effect is better. [0004] However, due to the low unit energy density output by the existing TIG argon arc welding, the shape of the arc is a large bell mouth shape, the temperature is low, the penetration is poor and unstable, and the heating area of ​​the workpiece is large. When the wor...

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Problems solved by technology

[0004] However, due to the low unit energy density output by the existing TIG argon arc welding, the shape of the arc is a large bell mouth shape, the temperature is low, the penetration is poor and unstable, and the heating area of ​​the workpiece is large. For large workpieces, the molten pool is large, the weld shape is large, the shape is poor, and the welding effect is not good; Increase the processing cost, and at the same time, due to the long processing time, the waste of shielding gas further increases the welding cost

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