DE1862132U - ARRANGEMENT FOR SPOT WELDING THE LONG EDGE OF A SLOTTED PIPE. - Google Patents

Description

Large pipe works Mannesmann-Hoesch GmbH », Duisburg-Mündelheim!

Gate direction for tack welding the longitudinal edges of a

S ehlit zphre s

In the manufacture of longitudinally welded large pipes, it is necessary to tack weld the longitudinal edges of the slotted pipe formed by transversely rounding a sheet metal strip before the welds are placed inside and outside the following welding systems can be fed continuously without interruption "T & D use" Liehe performing the hilt welding the slotted tube and distinctive means of a series of ■ point-like welds has several laughs rush "Because of the performance at high speed penetration of the weld points is often insufficient, additional welds by hand necessary so that the open-ended tube is avoided »

In addition, it is inevitable that the tack weld points protrude relatively high above the screw surface »so that it is covered by the external weld seam these are made undesirably high and wide "

The device according to the innovation provides the possibility, instead of the point-like tack welding of the slotted tube edges, a tack weld through a continuous thin To accomplish the welding seam with sufficient speed, namely this stitching seam is made by means of an electric arc -

welding 1

with more than two in a row under powder or im Protective gas is generated at the same time melting "bare electrodes. The device, which has been tried and tested in practical operation, is according to the hiring consists in that in the direction of advance of the pipe a welding head with an electrode inclined at an acute angle £ </ in relation to the direction of advance and provided with a projection behind it a second welding head with two electrodes is arranged, which are at an obtuse angle / 3 to the direction of travel lie inclined one behind the other.

The tack weld through a continuous weld Offers considerable advantages · The risk of the The slot is completely eliminated »Additional hand welds are no longer required »The subsequent internal welding can work at a higher speed because the previously existing weld points between the stitching no longer possible to break through the inner seam given is. The outer seam can be kept flatter than before because the narrow stitching seam is easy to cover »

An embodiment of a device according to the innovation is shown schematically in the drawing «

The Kohr R, whose longitudinal edges are connected by tack welding are to be pushed forward in the direction of the arrow χ under the fixed welding device » The welding device has two between the powder feed device d and the powder suction device e Welding heads on »The first welding head leads the weld a bare wire electrode a at an angle ί </ of about 10 to the vertical in a trailing arrangement The following welding head is fed with two wire electrodes b, c, that of the weld at an angle / 3of 15 to the vertical are fed in an upright arrangement »

In practice, with an arrangement in which the distances between the electrodes b and c

Claims (1)

about 10 mm and between the electrodes a and b about 25 mm and the first welding head with 36 YoIt and 550 amps, the second operated with 26 ToIt and 700 amps a welding speed of 5.2 m / min · achieved « Protection claimi An apparatus for tack welding the longitudinal edges of the slotted tube in preparation for the longitudinal seam welding, in particular for the production of large diameter pipes, characterized in that in the feed direction of Eohres a welding head having an inclined to the feed direction at an acute angle (■ &) electrode and in the feed direction behind a second welding head is arranged with two electrodes, which are inclined at an obtuse angle (ß) to the feed direction, one behind the other » DipM ⁿ g * ^w ' ^iyA f ^spner / il ::