JPH07276095A - Backing material for one-side welding - Google Patents

Abstract

PURPOSE:To provide a backing material for one-surface welding which eliminates a recess in the top surface of a back bead due to a deficiency in degassing and makes the outward appearance of the bead beautiful and excellent. CONSTITUTION:The backing material for one-surface welding is formed by adhering tile-shaped solid flux 1 to aluminum foil 4 which is coated with an adhesive 5 over the entire surface on the opposite surface from the surface containing a bevel reverse surface. The solid flux 1 has a slag pocket 2 in the surface coming into contact with the bevel reverse surface and one continuous recessed degassing groove 7 is formed in the surface of the slag pocket 2. Consequently, the top surface of the back bead is prevented from being recessed owing to the deficiency of degassing in one-surface welding and an excellent bead shape is obtained.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a backing material used for single-sided arc welding.

[0002]

2. Description of the Related Art Conventional one-sided welding backing materials (hereinafter referred to as backing materials) include those obtained by solidifying and molding flux, tape-shaped inorganic glass fibers, and glass fibers on solid flux. There is one arranged. For example, Japanese Examined Patent Publication (Kokoku) No. 57-22680 describes a backing material obtained by solidifying and molding a flux in a tile shape.
No. 30088 discloses a backing material in which a solid material and glass fibers are arranged.

[0003]

When these backing materials are used, the bead appearance and bead shape are good to some extent, but the gas generated during welding cannot be completely exhausted and the bead surface has a dent. There is. Therefore, in order to prevent dents on the bead surface, grooves are also provided on the surface of the solid backing material other than the slag pockets that contacts the groove back surface, but the shape and uniformity of both ends of the bead are not uniform. I have a problem.

An object of the present invention is to provide a backing material which eliminates the above-mentioned problems, that is, the depressions on the surface of the back bead due to insufficient gas escape, and which provides a beautiful and good bead appearance.

[0005]

According to the present invention, a tile-shaped solid one-sided welding backing is adhered to an aluminum foil 4 coated with an adhesive 5 on the entire surface on the side opposite to the surface in contact with the groove back surface. This material has a slag pocket 2 on the surface in contact with the groove back surface, and at least one continuous concave degassing groove 7 on the surface of the slag pocket 2 Is.

[0006]

The function of the present invention will be described in detail below.

As shown in FIGS. 1 to 3, the present invention has a slag pocket 2 on the side of the base material 3 to be welded which is in contact with the groove back surface, and a concave degassing groove 7 on the surface of the slag pocket 2. A backing material having a shape and a constitution in which a tile-shaped solid flux 1 is brought into contact with an aluminum foil 4 having an adhesive 5 to a base material 3 to be welded on a surface vertical to a welding line and continuously stuck to be integrated. Is.

The reason why the slag pocket 2 is provided on the surface in contact with the groove back surface is to obtain the stability of the back bead in single-sided welding. That is, by providing the slag pocket 2, as shown in FIG. 4, the back slag 10, which is a part of the slag produced during welding, can flow to the back surface of the back bead 8, and the solid flux 1 and the back bead 8 can be flowed. The layer of the back slag 10 is uniformly formed between the back bead 8 and the back bead 8, and the glossy and uniform back bead 8 can be formed. Then, by providing a continuous concave-shaped degassing groove 7 on the surface of the slag pocket 2, the gas that has accumulated in the back bead 8 and the layer of the back slag 10 and has no other escape place is provided in the degassing groove 7. Escape and collect gas 1
It can be set to 2 and prevents a depression from being formed on the bead surface.

The shape of the slag pocket 2 can be arbitrarily determined depending on welding conditions and the like. For example, for use in ordinary gas shield one-sided welding, width: 7 to 20 mm, depth: 0.
The thickness is preferably about 3 to 2 mm, and may be an arc shape or a rectangular shape.

If the continuous recessed degassing groove 7 provided on the surface of the slag pocket 2 is small, the slag is filled up and does not function as a gas vent, and if it is too large, it functions as a gas vent, but a convex portion on the bead surface. And the bead appearance is poor. As a result of various examinations, groove width: 2-3 mm, groove depth: 3
A rectangular shape of about 4 mm or a groove bottom having an arc shape is preferable.

If the slag pocket 2 has a narrow groove width of 10 mm or less, the number of the gas venting grooves 7 is one and the gas venting effect is obtained, and a good back bead appearance is obtained. or,
When the groove width of the slag pocket 2 is more than 10 mm and 15 mm or less, the same effect can be obtained with two grooves. Further, when the groove width of the slag pocket 2 is more than 15 mm, the same effect can be obtained with three. In this way, the effect of degassing can be obtained by the number of 1 to 3 depending on the groove width of the slag pocket 2.

As shown in FIG. 1, the solid flux 1 is made into a tile shape and continuously adhered to the tape-shaped aluminum foil 4 to form an integral backing material. The backing material has a longitudinal direction and a twisting direction. This is because it can be freely deformed and applied to a bending member, and can be sufficiently adapted to a difference in groove. Also, because of the tile-shaped structure, it can be freely cut according to the required length during use. Further, as shown in FIG. 1, if the adhesive 5 is applied to the aluminum foil 4 and the protective paper 6 is attached to the portion to be adhered to the base material to be welded, as shown in FIG. It is only necessary to peel off 6 and adhere to the base material 3 to be welded.

The material of the tile-shaped solid flux is cordierite-based ceramics and has a composition of SiO ₂ : 4:
5-70 wt%, Al ₂ O _3: 15~40 wt%, Mg
O: in the range of 5 to 30% by weight, and SiO ₂ , Al ₂ O
It is suitable that the total of ₃ and MgO is at least 90% by weight, and the tile shape has a width of 25 to 50 mm and a length of 2
5 to 50 mm and thickness: 8 to 15 mm are suitable.

The thickness of the aluminum foil may be 0.1 to 0.2 mm which is generally used. The adhesive may be a commonly used synthetic rubber type or epoxy resin type.

[0015]

[Examples] Table 1 collectively shows the configurations, welding conditions and test results of the backing materials of Examples and Comparative Examples. 1
No. 4 to No. 4 are examples. 5 to 10 are comparative examples.
In the examples, the composition is S as a tile-shaped solid backing material.
iO _2: 52 wt%, Al ₂ O _3: 32 wt%, Mg
O: 13 wt% and other 3 wt% were used. The length of the solid flux 1 in the welding line direction is 30 m
m, width 30 mm, height 10 mm, and the adhesive was synthetic rubber.

[0016]

[Table 1]

Example No. Nos. 1 and 2 are downward postures. Three
Nos. 4 to 4 were in the horizontal postures, and the shape of the back bead was uniform in all cases, and there was no dent due to insufficient gas release, and a good back bead shape was obtained.

Comparative Example No. 5 to 7 are downward postures. N
o. Nos. 5 and 6 had no groove for degassing, and all had a small number of dents on the back bead surface due to insufficient degassing. No. 7
Shows the case where a gas venting groove having a groove width of 1 mm and a groove depth of 1 mm was provided, but the gas escape was insufficient and a small number of dents were formed on the back bead surface due to insufficient gas escape.

No. 8 to 10 are horizontal postures. No.
No. 8 did not have a groove for degassing, and many recesses were formed on the back bead surface due to insufficient degassing. No. No. 9 was a case where a gas venting groove having a groove width of 1 mm and a groove depth of 1 mm was provided. However, the gas was insufficiently released, and a small number of dents were formed on the back bead surface due to insufficient gas escape. No. 10 is groove width 4mm, groove depth 5m
In the case where the gas venting groove of m was provided, no dent due to insufficient gas release was generated, but the groove was too large, so a convex portion was generated on the back bead, and the bead shape became defective.

From the above results, the degassing groove has a groove width of 2
It can be seen that about 3 mm and a groove depth of about 3 to 4 mm are good.

[0021]

INDUSTRIAL APPLICABILITY The backing material of the present invention can prevent the occurrence of dents on the back bead surface due to insufficient gas escape in single-sided welding,
A good bead shape can be obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a backing material of the present invention.

FIG. 2 is a view showing a state where the backing material of the present invention is used in a downward posture.

FIG. 3 is a view showing a state in which the backing material of the present invention is used in a horizontal posture.

FIG. 4 is a diagram showing a state after welding using the backing material of the present invention.

[Explanation of symbols]

 1 Solid Flux 2 Slag Pocket 3 Welding Base Material 4 Aluminum Foil 5 Adhesive 6 Protective Paper 7 Gas Venting Groove 8 Back Bead 9 Solid Flux Semi-Melted Part 10 Back Slag 11 Front Slag 12 Gas Reservoir

Claims (1)

[Claims] 1. A tile-shaped solid one-sided welding backing material, which is bonded to an aluminum foil (4) coated with an adhesive (5) on the entire surface opposite to the surface in contact with the groove back surface, A single-sided welding back having a slag pocket (2) on the surface in contact with the groove back surface and at least one continuous concave degassing groove (7) on the slag pocket (2) surface. This material.