JP3268148B2 - Horizontal welding lamination method - Google Patents

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 at the time of, for example, welding a ship-side outer panel.

[0002]

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

[0003] Reference numeral 2 denotes a backing material, and 3 denotes a fronting material, which prevents molten metal 7 generated by welding from melting down to the back plate side or the front plate side. Reference numeral 6 indicates the oscillating direction of the welding torch.

[0004]

However, when a steel plate having a thickness of 20 mm or more is formed in a horizontal position and the formation of the back bead and the formation of the front bead are simultaneously satisfied by the conventional horizontal welding method as described above, the groove gap 8 is required. Therefore, there is a problem that welding defects such as an undercut 9, a blow hole, and a slag entrainment 10 occur.

SUMMARY OF THE INVENTION An object of the present invention is to provide a new transverse welding laminating method which solves the above-mentioned disadvantages, reduces welding defects, ensures formation of back and front beads, and shortens repair time. I have.

[0006]

Sideways welding lamination process of the present invention as a configuration for achieving the above object, according order to achieve the above, in the lateral direction welded lamination method using a consumable-electrode gas-shield arc, one layer
Eye welding: torch angle 5 ° -15 °, receding angle 5 ° -15
Put the oscillate in the welding torch at 0 ° ~ 5mm at °
2nd layer welding, torch angle 5 ° ~ 15 °, receding
At an angle of 20 ° to 35 °, press the metal to the extent
Rate, and the welding of the third layer is at a torch angle of 5 ° to 15 °.
°, 90 ° front-back angle, without oscillating .

[0007]

According to the present invention, the formation of the back side bead is ensured by the first layer welding method (one pass or two passes) corresponding to the groove gap. In this case, the backing material is useful for preventing the molten metal from bleeding to the back plate side and for forming a good back bead.

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

Further, by taking the receding angle of the welding torch, the precedence of the molten metal is prevented and the defect is eliminated.

Further, according to the present invention, it is possible to cope with the formation of the back side 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. 1A and 1B show a weld bead formation diagram in a case where a groove width is narrow according to a first embodiment of the present invention, wherein FIG. 1A is a side view, and FIG.
Is a front view. FIGS. 2A and 2B show a weld bead formation diagram in the case of a large groove width according to a second embodiment of the present invention, wherein FIG. 2A is a side view and FIG. 2B is a front view. 3 and 4 show the welding torch angle and the welding lamination diagram for the first to third layers.

In these figures, reference numeral 1 denotes an upper plate to be welded, and 1 'denotes a lower plate to be similarly welded. For example, a plate which requires horizontal welding, such as a ship side outer plate of a ship, is preferable.

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

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

Reference numeral 4 denotes a welding torch attached to a welding device (not shown). The torch 4 has an amplitude and a swinging speed variable by an oscillator (not shown).
The arc position can be adjusted back and forth and up and down with respect to the welding progress direction by a torch position adjuster not shown, and the welding torch angle and the front and rear angle can be adjusted by an angle adjuster not shown. ing.

Reference numeral 5 denotes a welding wire. The wire 5 is sent out by a welding torch 4 and performs welding of the first to third layers.

Reference numeral 6 denotes an arrow indicating an oscillating direction of the welding torch 4, reference numeral 7 denotes molten metal, and reference numerals 8, 8 'denote groove gaps. (8
Is when the groove gap is small, 8 'is when the groove gap is wide)

The entire welding apparatus (not shown) equipped with a welding torch is moved in a welding direction (indicated by a straight arrow in each figure) by a traveling cart (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 in accordance with the groove gap 8.
Pass as torch angle (5 ° to 15 °), receding angle (5 to 1)
Oscillate 6 on the welding torch 4 at 5 °)
m. In the drawings, a and a 'indicate lamination by welding of the first layer.

Next, the welding of the second layer is performed at the torch angle (5 °).
At an angle of receding angle (20 ° to 35 °), the oscillating 6 is performed to the extent that the molten metal 7 reaches the covering material 3 to form a front bead. In addition, b in the figure shows lamination by welding of the second layer.

Further, the welding of the third layer is performed at a torch angle (5 °).
１５15 °), at an angle of 90 ° with no oscillate. Note that, in the drawing, c and c 'indicate the state of lamination by welding of 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-described embodiments, but can be variously modified within the scope of the technical idea of the present invention. Belonging to the target range.

[0025]

As described above, according to the transverse welding lamination method of the present invention, the following effects can be obtained. (1) The range of conditions is wide with respect to the groove gap variation at the time of welding the first layer, and the formation of the back side bead is good.

(2) The formation of the front side bead during the welding of the second layer is ensured.

(3) Welding defects such as undercut, slag entrainment, blowholes, etc., which occur during the conventional horizontal welding method, are reduced, and good horizontal welding is enabled.

(4) The repair time was reduced and efficient welding was achieved.

[Brief description of the drawings]

FIG. 1 is a view showing a weld bead formation in a case where a groove width is small according to a first embodiment of the present invention, wherein (a) is a side view and (b) is a front view.

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

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

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper plate 1 'Lower plate 2 Backing material 3 Front material 4 Welding torch 5 Welding wire 6 Oscillating direction of welding torch 7 Metal 8,8' Groove gap

──────────────────────────────────────────────────続 き Continuing the front page (72) Masaru Matsumoto 1-1, Akunouramachi, Nagasaki City Inside Nagasaki Shipyard, Mitsubishi Heavy Industries, Ltd. (56) References JP-A-50-90546 (JP, A) JP-133046 (JP, A) JP-A-61-38779 (JP, A) JP-A-60-18279 (JP, A) JP-B-55-51672 (JP, B2) (58) Fields investigated (Int. . ^7, DB name) B23K 9/12 B23K 9/022 B23K 9/035 B23K 9/095 B23K 9/00

Claims (1)

(57) [Claims] In a transverse welding lamination method using a consumable electrode type gas shield arc, the first layer is welded at a torch angle of 5 °.
Up to 15 °, swept angle 5 ° to 15 ° with welding torch
Insert a 0 to 5 mm slot and weld the second layer
Molten metal at a reach angle of 5 ° to 15 ° and a sweepback angle of 20 ° to 35 °
Is oscillated until it reaches the dressing material.
Oscillating with a torch angle of 5 ° to 15 ° and a front and rear angle of 90 °
Horizontal welding lamination method characterized in that it is carried out without inserting the metal.