Welding power source and control method of welding power source

Abstract

The present invention provides a welding power source and a control method of the welding power source. In a wide range of welding current range, appropriate droplet transfer can be maintained corresponding to changes in physical properties of the molten droplet and molten pool, and good welding workability can be obtained. A welding power source (10) includes a storage unit DB having at least melting information of a welding wire (1) for each shielding gas composition. If the wire feed speed setting signal (Wff) (m / min) is input to the storage unit DB, when the welding current signal (Ir) obtained from the melting information is 350A or less, the corresponding welding current signal (Ir ) to control the external characteristic gradient signal (Ks) (V / 100A) so that the upper limit is 0.004×Ir-1.9 and the lower limit is 0.0032×Ir-3.82, and the welding current signal ( When Ir) exceeds 350A, control the external characteristic gradient signal (Ks) (V / 100A) according to the welding current signal (Ir) so that the upper limit is -0.0067×Ir+1.8333 and the lower limit is - 2.7 within the appropriate range.

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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