FR2582237A1 - Method for eliminating the weld bead inside longitudinally welded tubes - Google Patents

Abstract

The invention relates to a triangular-shaped prism A, fixed at the end of an impeder B by a rod C. A conduit D will supply the pressurised gas. The cover E will serve for shaving the bead of the tube, which will move forward in the opposite direction from blowing, according to the arrow F, and a dish G equipped with a slot at its base will allow the coolant water of the impeder to escape, the arrival of which will take place via the conduit H and will protect the walls of the latter against the sparks which would risk adhering at the top.

Description

 The present invention relates to a method and a device for supercharging the welding corton from the interior of welded tubes at the udder, by blowing.

 Various methods already exist, such as scraping or crushing.

of the inner weld bead, but these methods have many drawbacks.

 The scraping leaving the welding burr inside the tube.

 Crushing requires expensive, fragile tools which cannot be used in small tube diameters.

 The present invention relates to a method allowing - in a simple way, to remove from the tube, a welding bead welded longitudi-nally, without preventing the continuation of the running of the tube.

 It is possible thanks to the process of the invention to considerably simplify the manufacture of internally deburred tubes, thus giving impeccable tube quality.

 To implement the method according to the invention, it is necessary to use a nozzle in the form of a triangular prism, fixed at the end of an impedor, for high frequency welding, and pierced with a conduit allowing the arrival of the gas under pressure and which will blow on the weld bead still in fusion.

 The accompanying drawing illustrates by way of nonlimiting example, an embodiment of the device according to the present invention.

 As shown, the device has a tip A, fixed at the end of the sham B, by a rod C passing through it.

 The gas used which will serve as blowing will be under pressure and will arrive by the conduit D in the nozzle A which will be drilled forming an angle E. The smaller the angle, the more the weld bead will be leveled and more, the pressure of the gas the higher, the more the cord will be hollow.

 The gas used may be either oxygen, nitrogen, compressed air and any other neutral gas; oxyene will be preferred, facilitating combustion and acting as oxygen cutting.

 The blowing angle E will be opposite to the travel of the tube (arrow F) mas may also be used in the same direction as the travel of the tube, but this second version is more delicate.

 The granule formed by the spark of the blowing, will fall on the impedor B and, would risk sticking, so it will be proceeded on the top of the iiupdeur to the installation of a bowl C, split at the bottom so that the cooling water of the impedor, which will arrive via the duct H, fills the bowl and thus overflows the impedor by entraining the granule thus solidified in the tube and which will disappear with the water.

 Modifications can be made to the embodiment described, in the field of technical equivalences; without departing from 17 invention.

Claims (3)

R E V E N D I C A T I O N S  1. Device to remove the welding sordon from the inside  of longitudinally welded tubes, in which the weld bead is  blown out.  2. Device according to claim 1, characterized in that  the granule, or sparking, is solidified by the cooling water  impedance.  3. Device according to any one of claims 1 and  2, characterized in that the impedance cooling water drives the granules into the tube and they disappear.