DE1056303B - Device for electric arc welding of workpieces using a flexible electrode wound on a carrier - Google Patents

Description

GERMAN

When welding thin material, it is known that a welding electrode must be more accurate are handled than when welding workpieces of greater thickness; so must the burn-in be kept exactly constant, as a thin workpiece burns through too easily; it is also more difficult with such thin workpieces, also in terms of appearance, to achieve good weld beads.

If now, according to a known proposal, the electrode covered with a non-conductive sheath is wound according to a helix or spiral on a carrier, result for the power supply particular difficulties for this electrode. In a known device of this type the actual welding current is supplied to the electrode via jaws arranged in the vicinity of the workpiece. In addition, the drum on which the flexible electrode dendratite is wound is still included another power supply. This additional power supply path should be a possible to the counteract the arcing caused by the mentioned jaws by utilizing the electrode resistance. Regardless of this additional power supply option the actual welding current should therefore be unanimous in accordance with the one previously represented Opinion to be fed to the electrode wire as close as possible in front of the welding point, whereby it is even considered necessary, the electrode wire tightly enclosing the jaws or even in the electrode having to use sharp knives.

The invention is based on the knowledge that this welding current supply is just before the arc No need at all, provided that it is about welding workpieces with a thickness of 3 mm or acts less and uses a flexible welding electrode with a core thickness of 2.5 mm or less which is fed to a workpiece by guide members, because such thin workpieces can be welded with correspondingly small welding currents that would otherwise not result in a could lead to excessive heating of the electrode, which is to be feared. From this knowledge 'should According to the invention, the power supply exclusively through one with the unclothed end of the Electrode on the carrier connected power supply terminal take place, which is when feeding the Electrode to the workpiece with the unwinding Electrode rotates.

The invention will be explained in more detail using the drawing showing the exemplary embodiments; in this drawing shows the device in side view.

The workpiece marked 1 is intended to represent an iron plate with a thickness of 2 mm, on which Device for electric arc welding of workpieces using

one wound on a carrier

flexible electrode

Applicant:

N. V. Philips' Gloeilampenfabrieken, Eindhoven (Netherlands)

Representative: Dipl.-Ing. K. Lengner, patent attorney, Hamburg 1, Mönckebergstr. 7th

Claimed priority: France, dated. 3rd December 1953

Andre Larigaldi and Jozef Ter Berg,

Bobigny, Seine (France), have been named as the inventor

the weld seam 2 is produced by melting off a welding wire 3. The melting takes place in that an arc burns between the wire end 4 and the workpiece 2. This end 4 of the welding wire 3 is taken from the guide rollers 5., 6 and 7 are guided in the desired direction, which can be determined by moving the handle 8 held welding machine can be changed. The distance between the lower guide roller 5 and the workpiece 1 should be so short that a disturbing oscillation of the welding wire end is not can occur. Of the guide rollers, the roller 6 is driven by an electric motor 9 via a reduction gear 10, 11 driven. The surface that comes into contact with the welding wire Roller 6 has a large number of notches that prevent the welding wire from sliding. In the handle 8, a variable resistor (not shown) is housed with which the rotational speed of the Roller 6 and therefore the feed speed of the welding wire 3 to the workpiece can be controlled can. The welding wire 3 with a length of, for. B. 180 cm is sidh in the rolled up state on a about the shaft 13 rotatable drum 12. The diameter of the drum is selected so large that none Damage to the welding wire covering during application of the welding wire occurs on the drum, the diameter of which is 35 cm. The drum can

.- _:. 909 508/374

Claims (1)

1 0 (56 3lQ3i: .. 250 cm clad welding wire with a throughput ".:. ■ diameter of 3.5 mm contained 14 In a clamp / attached for securing the Schweißdra htendes to the drum, the clamp 14 is together with the drum 12 about the shaft 13.. rotatable and is S connected to one pole of the welding current generator (not shown). During the welding process, the welding wire is slowly withdrawn from the drum and thrown through the driven roller 6 fed to the workpiece .. The welder can use the control resistor in the Handle 8 regulate this speed so that it is equal to the speed with which the Welding wire is melted from the flame arc. Claim: Device for electric arc welding of workpieces with a thickness of 3 mm or less : get üitter, use of a flexible electrode with a core thickness of 2.5 mm or less, clad with a non-conductive coating and wound on a carrier according to a helix or spiral, which is fed to a workpiece by guide members, characterized in that the current is supplied exclusively through a current supply terminal connected to the unclad end of the electrode on the carrier, which rotates with the descending electrode when the electrode is fed to the workpiece. Considered publications:
German Patent No. 354 710;
British Patent Specification: 143,331;
U.S. Patent No. 2,094,411. 1 sheet of drawings