JPS6037268A - Automatic vertical welding method - Google Patents

Abstract

PURPOSE:To prevent generation of a gouging flaw in the groove of a horizontal joint by inserting a removable block into the crossing part of a vertical joint and the horizontal joint, placing a start piece on the block, starting welding and removing the block after welding. CONSTITUTION:A clay or refractory block 15 which can be disintegrated or drawn away after welding is inserted into the lower part 13 of a vertical joint 12 crossing in an inverted-T shape with a horizontal joint 14 of a side plate 11. A start piece 16 for vertical welding consisting of the same material as or similar to the material of the plate 11 on the block 15 and welding is started from the piece 16. The block 15 is disintegrated or drawn away upon completion of vertical welding and at the same time the weld metal 17 and the start piece 16 in the start part are removed by gouging. The space 18 between the piece 16 and the joint 14 is made into the thorough cavity and gounging is made easy.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an automatic welding method for vertical joints such as side plates.

As shown in Fig. 1, when electroslag or electrogas welding is performed on the vertical joint 2 between the storage tank side plates 1, if the automatic welding start part 3 is welded as is, the weld metal will flow into the horizontal joint groove 4. , it is known that welding becomes impossible. In order to prevent such a situation, conventionally, the second
As shown in the figure, the automatic welding start part 3 is manually welded to form the weld metal outflow stop part 5, or as shown in Figure 3, a start tab 6 is added and automatic welding is performed from above. , either method is adopted. However, the method of forming the flow stop part 5 shown in FIG. 2 not only requires manual welding, but also requires grinding the surface so that the sliding stopper for automatic welding comes into close contact with the flow stop part. Work is also required. In addition, the method of adding the start tab 6 shown in FIG. 3 is such that when the start tab 6 is removed after welding is completed, the weld metal 7 at the welding start part and the start tab 6 are shaped like a boat, as shown in FIG. In addition, if the gouging skill is insufficient, the remaining tab 8 will be welded within the groove during gouging and will be difficult to remove. It is also the cause of leaving scars due to gouging.

The present invention aims to solve these problems and provide an automatic vertical welding method that not only facilitates gouging at the welding start point but also eliminates the risk of gouging scratches. A block that can be crushed or pulled out and removed after welding is inserted into the intersection of the vertical joint and the horizontal joint, and a starting piece made of the same or equivalent material as the welding base material is placed on top of this block. , Welding is started from above this start piece, and after welding is completed, the block is removed and the weld metal at the welding start part and the start piece are removed by gouging.

The vertical automatic welding method according to the present invention will be described below with reference to the embodiments shown in the drawings.

5 and 6 are explanatory views showing the steps of the vertical automatic welding method according to the present invention. First, the intersection of the vertical joint 12 and the horizontal joint 14, that is, the horizontal joint 14 of the side plate 11
A block 15 made of clay or refractory material that can be crushed or pulled out and removed after welding is inserted into the lower part 13 of the vertical joint 12 that intersects the shape, and a side plate 11 that is the base material for welding is placed on this block 15. A starting piece 16 for vertical welding made of the same or equivalent material is placed, and an arc for vertical welding is generated on this starting piece 16 to start welding.

When the vertical welding is completed, as shown in FIG. 6, the clay or refractory block 15 is crushed or pulled out and removed, and the weld metal 17 and start piece 16 at the welding start part are gouged and removed. The welding method related to this ends.

As explained above with reference to the embodiment shown in the drawings, according to the vertical automatic welding method according to the present invention, the block 15
With the start piece 16, the gap 18 between the start piece 16 and the groove of the lateral joint 14 is completely hollowed out, making gouging very easy and eliminating the risk of causing gouging scratches on the groove of the lateral joint 14. It has the following effects.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of a vertical joint consisting of side plates arranged in a stacked manner, Figures 2 to 4 are illustrations showing a conventional vertical joint welding method, and Figures 5 and 6 are illustrations of a vertical joint welding method. FIG. 3 is an explanatory diagram showing the procedure of a vertical automatic welding method according to the present invention. 12...Vertical joint, 14...Horizontal joint, 15...Block, 16...Start piece, 17...Weld metal. Patent Applicant: Mitsubishi Heavy Industries, Ltd. Patent Attorney, Mitsubishi Heavy Industries, Ltd. Dobe (and 1 other person) Figure 5 Figure 6
figure

Claims (1)

[Claims] A block that can be crushed or pulled out and removed after welding is inserted into the intersection of the vertical joint and the horizontal joint, and a start piece made of the same or equivalent material as the weld base material is placed on top of this block. A vertical automatic welding method characterized in that welding is started from above, and after welding is completed, the block is removed and the weld metal at the welding start part and the start piece are gouged and removed.