DD295111A5 - DEVICE FOR THE OPTICAL OBSERVATION OF THE UP WELDING PROCESS, PREFERABLY SENKRECHT PUNCTURED STUNNING WITH ROOT SPLIT - Google Patents

Abstract

The invention relates to a device for optical observation of the UP-Schweiszprozesses on preferably vertically inclined Stumpfnaehten with root gap and serves to make process technical Vorgaenge in the UP cavern visible. The facility consists of an artificial cavern of quartz glass or ceramic, which is fixed above the molten pool and the Schweiszkopfes and adapted to the joint geometry. In addition, the root-side bath fuse contains a window made of transparent quartz glass, which allows the optical access to the hidden welding process during the welding process. The welding process is not adversely affected. {UP welding process; Stumpfnaehte; Root gap; UP cavern; Schmelzbadsicherung; Schweiszkopf; Joint geometry; Quartz glass, root side; optical access}

Description

V _K = 35 * A _F + 7.5 * l _s and b _K = (1.4 ... 2.0) * b _F

be predetermined, where Vk is the volume of the cavity in mm ³ , A _F the joint area in mm ² , Is the welding current in A, b «is the width of the cavity in mm and b _{F is} the width of the joint in mm;

- The root-side swimming backup contains a window, which guarantees the optical access to cavern-side process events when crossing the artificial cavern;

- The window consists of a heat-resistant, non-conductive and transparent material, preferably quartz glass.

For this 2 pages drawings

Field of application of the invention

The invention finds application in sub-powder (UP) welding at preferably vertically inclined butt welds with Wurzolspalt and serves to visualize process technical processes.

Characteristic of the known state of the art

For the development of UP welding at vertically inclined seams, the investigations of the melting and melting processes as well as the material transition are of particular importance. Due to the process-specific concealed arc burning in a cavern these processes are not visible.

Previous methods, the over-welding of a protruding into the cavern chamber ceramic tube and the matched by means of a joint shape quartz glass or ceramic strip in the welding direction keeping open the cavern, allow observation (photo and cinematographic recordings) to vertically inclined buttocks only above the supplied filler material , Both methods influence the welding process by opening the cavern.

An X-ray observation / 1 / is disadvantageous due to the transmission principle with significant loss of information and high equipment complexity.

Object of the invention

The aim of the invention is to provide a device for the optical observation of the UP welding process on predominantly vertically inclined butt welds with root gap, which makes it possible to visualize process engineering processes in the UP cavern.

Explanation of the essence of the invention

The invention is based on the object by means of a special device to make visible in the UP welding at predominantly vertically inclined butt welds with root gap in the cavern processes running without affecting the welding process negative

 According to the invention the object is achieved by

- The UP cavern is replaced by a, above the Schmelzbadsicherung and the Schweißkopfos fixed, the joint geometry adapted and with welding speed up moving artificial cavern;

IM Blasig, K .: Contribution to Unterpulververbindungsschwelßen with narrow band electrodes; This. A; TH Aachen 1984

- The artificial cavern consists of a high temperature resistant non-conductive material, such as quartz glass or ceramic;

- the volume of the artificial cavern corresponds to that of the natural cavern and according to the equations

V _K = 35 -Af + 7.5 -I ₈ and b _K = (1.4 ... 2, O) -b _f

where Vk is the volume of the cavity in mm ³ , Af the joint area in mm ² , Is the welding current in A, b _K the width of the cavity in mm and b _F the width of the joint in mm;

- The root-side swimming backup contains a window, which guarantees the optical access to the Cavern side process event when crossing the artificial cavern;

- The window consists of a heat-resistant, non-conductive and transparent material, preferably quartz glass. After the ignition of the arc and the beginning of the welding process takes place in the invention underlying artificial cavern, the complete melting of the powder.

As the molten powder flows in the direction of the molten bath and the forming weld, following the laws of gravity and, in addition, no further powder outside the artificial cavern is melted, the concealed processes in the UP cavern become visible

 The welding process continues to be maintained and the molten pool protected by the artificial cavern.

AusfOhrungsbeisplel

The invention will be explained using the example of the UP welding a Steilflankennaht in a vertical position. The accompanying drawings show

Fig. 1: The device on a vertically placed sheet with horizontally supplied filler material Fig.2: The device in cross section.

Before the beginning of the UP welding process, the artificial cavern 2 is filled with welding powder 11 and on the against Welding part 1 pressed melt pool 4 fixed above the welding head 7 and the welding filler 3. The hermetic sealing of the artificial cavern 2 with respect to the atmosphere is effected by the adaptation of the same

the geometry of the Schweißteilfuge, through the powder bed 11 and forming liquid and solid Schmelzbad- and

Slag particles 12,13. The powder in the artificial cavity 2 is ignited after the arc (not shown in FIGS. 1 and 2) at the beginning of the arc Welding process in slag 12 remelted and accumulates below the supplied filler material 3 at. The powder holder 8 and the resulting weld 6 are also shown. The root-side Schmelzbadsicherung 5 is already on the weld part 1. The incorporated window 9 allows, in itself

concealed processes in the cavern during UP welding and visual

Recording technique 10 hold.

Claims (1)

Device for optical observation of the UP welding process on preferably vertically inclined butt welds with a root gap, characterized in that - The UP Kaveme is replaced by a, above the Schmelzbadsicherung and the welding head fixed, the joint geometry adapted and with welding speed up moving artificial cavern; - The artificial cavern consists of a high temperature resistant non-conductive material, such as quartz glass or ceramic; - the volume of the artificial cavern corresponds to that of the natural cavern and according to the equations