Welding power source and control method for welding power source

Abstract

The invention provides a welding power source and a control method for the welding power source. In a wide range of welding current domains, appropriate droplet transitions are maintained in responseto changes in the physical properties of the molten droplets and the molten pool, and good welding workability is obtained. The welding power source (10) includes a storage section DB having at leastmelting information of the welding wire (1) in a composition of each shielding gas. If the wire feed speed setting signal (Wff) (m / min) is input to the storage section DB, external characteristic tilt signals (Ks) (V / 100A) are controlled in response to the welding current signal (Ir) when the welding current signal (Ir) obtained from the melting information is less than 350A, the external characteristic tilt signals are enabled to be within the appropriate range of setting the upper limit to 0.0004 * Ir-1.9 and the lower limit to 0.0032 * Ir- 3.82. When the welding current signal (Ir) exceeds 350A, the external characteristic tilt signal (Ks) (V / 100A) is controlled corresponding to the welding current signal (Ir), so that the upper limit is set to 0.0007 * Ir + 1. 8333 while the lower limit is set to a suitable range of -2.7.

Description

technical field [0001] The invention relates to a welding power source and a control method for the welding power source. More specifically, it relates to a welding power source and a welding power source for performing gas-shielded arc welding by controlling appropriate external characteristics for each welding current range in accordance with the composition of shielding gas, preferably in addition to material properties of consumable electrodes. control method. Background technique [0002] In gas shielded arc welding, the behavior of droplet transfer changes depending on welding conditions such as shielding gas composition, welding current, material of consumable electrode (also called "welding wire"), and the like. Welding workability differs for each type of droplet transfer behavior. In order to improve the welding workability of the gas shielded arc welding by the control on the welding power source side, it is necessary to perform appropriate control for each drop...

AI Technical Summary

Problems solved by technology

[0011] As mentioned above, in order to control the physical properties of the molten material, it is necessary to control the temperature of each detached droplet and molten pool, that is, each welding current and material property, but there is no such thing in Patent Document 1 and Patent Document 2. any consideration

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