JPH08174219A - Sidewise welding laminating method - Google Patents

Abstract

PURPOSE: To ensure the bead forms at back side and at front side and to reduce the welded defect and the repairing time in a sidewise welding method performed at the time of welding a ship side outer plate, etc. CONSTITUTION: The welding with a welding torch 4 according to the bevel gap 8 between an upper plate 1 and a lower plate 1' is firstly executed as a first layer welding in one pass or two passes to form the back side bead. Successively, a second layer welding is laminated and the welding torch 4 is oscillated until molten metal 7 reaches the front protector 3 to form the front side bead. Then, a third layer is laminate-welded without oscillating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal arc welding method which is carried out, for example, when welding outer shells of ships.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a conventional horizontal welding method.
In the figure, 1 is an upper plate of a steel plate having a plate thickness of 20 mm or more, and 1'is a lower plate thereof, which is welded to a groove portion of both plates in a horizontal position by using a welding torch (not shown).

Reference numeral 2 is a backing material, and 3 is a front material, which prevents molten metal 7 generated by welding from melting down to the back plate side or the front plate side. In addition, 6 shows the oscillating direction of the welding torch.

[0004]

By the way, in the case of simultaneously forming the back bead and the front bead at the same time in the horizontal orientation of a steel plate having a plate thickness of 20 mm or more by the above-described conventional horizontal welding method, the groove gap 8 is not satisfied. However, there is a problem that welding defects such as undercut 9, blowhole, and slag inclusion 10 occur.

An object of the present invention is to solve the above problems and to provide a new horizontal welding laminating method which reduces welding defects, ensures formation of a back bead and a front bead, and shortens repair time. There is.

[0006]

As a structure for achieving the above-mentioned object, a horizontal welding lamination method of the present invention comprises a traveling carriage,
From an oscillator with variable amplitude and swing speed, a torch position adjuster that can adjust the arc position forward and backward and up and down with respect to the welding advancing direction, an angle adjuster that adjusts the welding torch angle and longitudinal angle, and a welding torch. In a horizontal welding lamination method using a consumable electrode type gas shield arc using a configured welding apparatus, first, a good backside bead is swept back at an angle of 5 ° to 1 by first-pass welding of one pass or two passes depending on the groove gap.
Formed under the conditions of 5 ° and torch angle of 5 ° to 15 °,
Next, the second layer is welded at a receding angle of 20 ° to 30 ° and a torch angle of 5 ° to 15 ° to form a front bead.
From the 3rd layer onward, the receding angle is 90 ° and only the torch angle is 5 ° to 15
The feature is that welding is performed at a certain degree.

[0007]

According to the present invention, the backside bead formation is secured by the first layer welding method (1 pass or 2 passes) corresponding to the groove gap. In this case, the backing material serves to prevent the molten metal from melting down to the back plate side and to form a good back bead.

Next, when welding the second layer, the amount of the second layer deposited is reduced in order to improve the formation of internal defects and surface beads. In this case, the front cover material prevents the molten metal from flowing down to the front plate side.

Further, by setting the receding angle of the welding torch, the advance of molten metal is prevented and defects are eliminated.

Further, according to the present invention, it is possible to cope with the formation of the backside bead regardless of whether the groove gap is wide or narrow.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a weld bead formation drawing in the case of a narrow groove width according to the first embodiment of the present invention, in which (a) is a side view and (b) is a side view.
Is a front view. 2A and 2B are views showing a weld bead formation in the case of a wide groove width according to a second embodiment of the present invention. FIG. 2A is a side view and FIG. 2B is a front view. Further, FIG. 3 and FIG. 4 show welding torch angles and welding stack diagrams for the first to third layers.

In these figures, 1 is an upper plate for welding, and 1'is a lower plate for welding, which preferably requires lateral welding such as a ship side outer plate of a ship.

Reference numeral 2 denotes a backing material for the upper and lower plates 1 and 1 ', which prevents the molten metal 7 from being melted down to the back side by the corresponding material.

Reference numeral 3 is a front cover material, which is attached to the front plate side of the lower plate 1'and similarly prevents the molten metal 7 from being burned out during welding.

A welding torch 4 is attached to a welding device (not shown), and the torch 4 has an amplitude and a swing speed which are variable by an oscillator (not shown).
The torch position adjuster (not shown) allows the arc position to be adjusted forward and backward and up and down with respect to the welding advancing direction, and the angle adjuster (not shown) allows the welding torch angle and forward and backward angles to be adjusted. ing.

A welding wire 5 is sent out by the welding torch 4 to weld the first to third layers.

Reference numeral 6 indicates an arrow indicating the oscillating direction of the welding torch 4, 7 indicates molten metal, and 8 and 8'indicate groove gaps. (8
(When the groove gap is small, 8'when the groove gap is wide)

The entire welding apparatus (not shown) equipped with a welding torch is moved in the welding direction (indicated by a straight arrow in each figure) by a traveling carriage (not shown) to perform horizontal welding.

First, the welding of the first layer will be described. In this case, welding is performed in one pass or two depending on the groove gap 8.
Torch angle (5 to 15 °) and receding angle (5 to 1)
Oscillate 6 on welding torch 4 at 5 °)
Put in m. In the figure, a and a'represent the lamination by welding the first layer.

Then, the welding of the second layer is performed by using a torch angle (5 °
˜15 °) and a receding angle (20 ° to 35 °), oscillate 6 is performed to the extent that the molten metal 7 reaches the surface support material 3 to form a surface bead. In addition, b in the figure shows the lamination by welding of the second layer.

Furthermore, the torch angle (5 °
~ 15 °), and the front-back angle is 90 °. In this case, no oscillate is added. In the figure, c and c'represent the laminated state by welding the third layer.

Table 1 shows the welding conditions at this time.

[0023]

[Table 1]

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments and can be variously modified within the scope of the technical idea of the present invention. Belong to the target range.

[0025]

As described above, the horizontal welding lamination method of the present invention has the following effects. (1) The condition range is wide and the backside bead formation is good even when the groove gap changes during the first layer welding.

(2) To ensure the formation of the bead on the front side during the second layer welding.

(3) Welding defects such as undercut, slag inclusion, and blowhole, which have occurred during the conventional horizontal welding method, are reduced, and good horizontal welding is possible.

(4) Repair time was reduced and efficient welding could be achieved.

[Brief description of drawings]

FIG. 1 is a view showing a weld bead when a groove width is narrow according to a first embodiment of the present invention, in which (a) is a side view and (b) is a front view.

2A and 2B are views showing the formation of a weld bead when the groove width is wide according to the second embodiment of the present invention, FIG. 2A being a side view and FIG. 2B being a front view.

FIG. 3 shows a welding torch angle and a weld stacking diagram in the case of FIG. 1, (a) and (b) showing a side view and a front view of the first layer,
(A) ', (b)' are side and front views of the second layer,
(A) ″, (b) ″ are a side view and a front view of the third layer.

FIG. 4 shows a welding torch angle and a welding lamination diagram in the case of FIG. 2, where (a) and (b) are a side view and a front view of the first layer,
(A) ', (b)' are side and front views of the second layer,
(A) ″, (b) ″ are a side view and a front view of the third layer.

FIG. 5 shows a welding bead formation diagram of a conventional horizontal welding method,
(A) is a side view and (b) is a front view.

[Explanation of symbols]

 1 Upper plate 1'Lower plate 2 Backing material 3 Surface material 4 Welding torch 5 Welding wire 6 Oscillating direction of welding torch 7 Metallurgical 8,8 'groove gap

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaru Matsumoto 1-1 1-1 Atsunoura-machi, Nagasaki City Mitsubishi Heavy Industries Ltd. Nagasaki Shipyard Co., Ltd.

Claims (1)

[Claims] 1. A traveling carriage, an oscillator whose amplitude and swing speed are variable, a torch position adjuster capable of adjusting the arc position forward and backward and up and down with respect to the welding proceeding direction, and a welding torch angle and a longitudinal angle. In a horizontal welding lamination method using a consumable electrode type gas shielded arc using a welding device composed of an angle adjuster and a welding torch, a good back side is obtained by first-pass welding of one pass or two passes depending on the groove gap. Set the bead to a receding angle of 5 ° to 15 ° and a torch angle of 5 ° to 1
It is formed under the condition of 5 °, then the second layer is welded at a receding angle of 20 ° to 30 ° and a torch angle of 5 ° to 15 ° to form a bead on the front side.
The horizontal welding lamination method is characterized in that only the torch angle is welded at 5 ° to 15 ° to prevent welding defects.