Wire forming unit and welding torch with wire forming unit

Abstract

The aim of the invention is to achieve a reliable constant contact in a welding torch with a contact sleeve with a wire forming unit and to reduce the frictional forces for the wire forming process. This is achieved in that three ball bearing-mounted rollers (4a, 4b, 4c) are arranged one behind the other in the longitudinal direction (x) of the welding torch (10) in the wire forming unit (1). Thecentral roller (4b), when viewed in the longitudinal direction (x), is offset in the wire forming unit (1) relative to the two outer rollers (4a, 4c), when viewed in the longitudinal direction (x), bya transverse offset (V) in a transverse direction (y) transverse to the longitudinal direction (x) in order to form a zig-zag-shaped path for the welding wire (3) through the wire forming unit (1), wherein the axial distance (A) between the two outer rollers (4a, 4c) when viewed in the longitudinal direction (x) is maximally 35 mm, preferably maximally 30 mm, more preferably maximally 20 mm.

Description

technical field [0001] The invention relates to a wire forming unit for forming a welding wire for a welding torch with a contact sleeve and a welding torch with a contact sleeve, the welding torch having such a welding wire forming unit. Background technique [0002] Welding methods using molten electrodes are well known. It is also known here to use the welding wire itself as an electrode, by means of a wire feeding unit feeding the welding wire to a welding torch in which a contact sleeve with an electrical potential is arranged. The wire contacts the contact sleeve as it is fed through the torch, whereby when the electric welding circuit is closed via the welding arc formed between the wire and the workpiece to be welded (which is usually at ground potential), a welding current can be passed through The contact sleeve flows over the wire. Examples of such welding methods are MIG (MIG) and MIG (MAG), wherein a shielding gas is additionally supplied to the welding site. ...

AI Technical Summary

Problems solved by technology

The problem in this case is that the welding wire again experiences an uncontrolled curvature in the absolutely possibly long hose assembly, whereby the contact in the contact sleeve cannot be reliably improved

This device is not suitable for reliable contact of the contact sleeve with the welding wire in the welding torch itself, because in order to determine the position and contact force of the contact point in the contact sleeve, the welding wire needs a defined bend

Furthermore, the device for straightening before the welding torch is arranged on the automatic welding machine, so that the movement of the welding wire between the device and the welding torch by the robotic arm may again acquire a curvature uncontrolled

Therefore, a reliable contact point or a reliable contact force may not be achieved in the contact sleeve of the welding torch

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