JPH01210172A - Fusion welding method for resin laminated metal plates - Google Patents

Abstract

PURPOSE:To improve quality of a weld bead by performing high energy density welding and passing through members to be joined and subjecting these to fusion joining and further, controlling the width of a molten pool to dimensions of specific times as much as the total plate thickness. CONSTITUTION:At the time of lap-welding resin laminated metal plates 1 and 2, the high energy density welding such as the plasma welding method is performed. In this case, a concentrated plasma arc 4 passes through the metal plates 1 and 2 and the molten pool 6 reaches the rear of the plate 2 and the weld bead 7 is obtained. At this time, the width W of the molten pool 6 is measured and the concentrating rate of the plasma arc 4 is controlled so that its value becomes less than five times as much as the total plate thickness (t) of the plates 1 and 2. Decomposed gas of a resin layer 13 is discharged by shielding gas from the end face of the plate 1 and gas of a resin layer 23 is also discharged by the arc 4. By this method, since discharging efficiency of the decomposed gas is improved and the occurrence of weld defects is prevented, the quality of the bead 7 is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for fusion welding resin-laminated metal plates, which allows resin-laminated metal plates to be welded in any joint type.

[Background Art] In recent years, measures to reduce noise in many noise-generating machines such as transportation machines and metal processing machines have become a major issue. Such countermeasures should be taken from both the structure and constituent materials of the noise generating body, and resin-laminated steel plates, generally called vibration-damping laminated steel plates, are useful materials from the latter point of view.

A vibration-damping laminated steel plate is a composite steel plate that is made by sandwiching a thin resin layer made of a viscoelastic resin between two steel plates, and the strength of the material is provided by the steel plate. The damping action is performed by an intermediate viscoelastic body. The sound reduction effect of vibration damping laminated steel plates is mainly related to the absorption of solid sound when the structure itself using the plate is the sound source, and is the most effective noise countermeasure. Moreover,
The viscoelastic material that makes up the distributed laminated steel plate is a very thin layer compared to the constituent steel plates, and can generally be treated in the same way as a normal steel plate, so this laminated steel plate has a wide range of applications. It is.

However, even though the viscoelastic layer of the distributed laminated steel plate is very thin, its physical properties are very different from those of the steel plate, so some care must be taken when processing it. That is, since a viscoelastic body is normally an electrical insulator, when performing resistance spot welding in assembling a structure, a special method such as the film control method specified in the Japanese Welding Association standard WES7301 must be used. Furthermore, it is known from Japanese Patent Application Laid-Open No. 133000/1983 that there are problems with the state of the end surface during cutting depending on the application. As in these examples, when using vibration-damping laminated steel plates, there may be cases where conventional techniques cannot be used due to processing technology.

There are many uses for vibration-damping laminated steel sheets, but continuous welding is often essential, such as in oil pans among automobile parts. An oil pan is a part located directly below the cylinder of an automobile engine to store engine oil.Since the oil pan receives vibrations from above, it generates a lot of noise, so vibration-damping laminated steel plates are used to reduce noise. Above all, it is extremely effective. On the other hand, however, when joining the members in step 1 during assembly, airtightness and great strength are required of the joining joint. For this reason, arc welding has been used when conventional steel plates are used. The type of welded joint in this case is generally a butt joint or a lap joint.

However, when vibration-damping laminated steel plates are used as members, continuous arc welding becomes extremely difficult. This is due to the fact that viscoelastic materials are generally organic substances and are electrical insulators, and that at high temperatures such as in arc welding, gas is generated due to evaporation, thermal decomposition, etc. This is because it is difficult. Therefore, when welding is required, the following methods are generally used.

For example, JP-A-60-003982, JP-A-60-8
As shown in Publication No. 7980, heat is applied to the end face of a vibration-damping laminated steel plate to ensure bonding over the entire thickness of the laminated steel plate, and the generated resin decomposition gas is removed from the welding point to the outside using shielding gas. This is a method of discharging it.

Using this method, two sets of joint types can be welded:

One method, as shown in Japanese Patent Application Laid-Open No. 60-003982, is to stack a normal steel plate on the bottom and a laminated steel plate on top, and fillet weld the end faces of the laminated steel plates.

Another method, as shown in Japanese Patent Application Laid-Open No. 60-87980, is to butt laminated steel plates at their end faces and butt weld them within the root gap.

[Problems to be Solved by the Invention] However, in the first joint type described above, it is impossible to weld unless the lower member is a regular steel plate, and if it is a laminated steel plate, heat reflection occurs at the resin interface. At the same time, welding becomes impossible due to the release of decomposed gas from the resin.

In addition, in the second joint type described above, it is difficult to butt the laminated steel plates together, and it must be done using a backing metal, and the root gap must be made thinner and stable welding must be continued. , there is a problem that the work becomes difficult and complicated.

The present invention makes it possible to weld laminated steel plates directly butted against each other in each of the joint types described above without being affected by heat reflection or decomposition gas interference, and without using a backing metal. The object of the present invention is to provide an extremely practical method for fusion joining resin-laminated metal plates, which allows stable welding even within a narrow root gap.

[Means for Solving the Problems] The method for melting and joining resin-laminated metal plates according to the present invention includes:
Usually, a thickness of 0.0 mm is placed between two metal plates with a thickness of 5 mm or less.
When welding a resin-laminated metal plate integrally constructed with 02 to 0.6 resin materials sandwiched between them to another resin-laminated metal plate or a normal metal member, plasma welding, pulsed arc welding, laser Using a high-energy density welding method such as a welding method or an electron beam welding method, the width of the molten pool is controlled to 5t or less, where t is the total plate thickness of the joining member, under the supply of shielding gas or assist gas. At the same time, the molten pool is passed through the entire thickness of the joining member to perform melt joining.

[For production]

In the present invention, by using a high energy density welding method, for example, in the plasma welding method, a compressed high temperature plasma stream is injected at high speed onto the end face or surface of a resin laminated metal plate, so that so-called keyhole welding is possible. It will be done. Therefore, almost no heat reflection occurs in the resin layer, and the generated decomposed gas is also discharged to the outside together with the plasma flow and under the action of the shielding gas.

Further, even in the case of pulsed arc welding in TIG welding or MIG welding, a plasma arc column with high rigidity can be obtained, so that the same effect as described above is performed.

Furthermore, even in the case of laser welding or electron beam welding, both have extremely high energy density and suppress heat conduction from the component surface, making it possible to achieve deep penetration welding. It is possible to obtain the same effect as the method.

[Example] Examples of the present invention will be described below.

FIG. 1 is an explanatory diagram of lap welding of resin-laminated metal plates by a typical plasma welding method, and FIG. 2 is a longitudinal sectional view thereof. In the figure, 1.2 is a resin laminated metal plate, 3 is a plasma torch, 4 is a plasma arc, 5 is a filler wire, 6 is a molten pool, and 7 is a weld bead.

Each resin laminated metal plate 1.2 has two metal plates 1
1, 12, 21 and 22 with a thin resin layer 13.23 sandwiched between them, and usually the thickness of each metal plate is 5 mm or less, and the thickness of the resin layer is 0.02 mm. It is in the range of ~0.6 dragons.

When such resin laminated metal plates 1 and 2 are overlapped and lap welded by plasma welding, the concentrated plasma arc 4 penetrates the lower resin laminated metal plate 2, and the molten boule 6 reaches the back surface, resulting in a sound weld. Bead 7 is obtained.

In this case, since it is practically difficult to detect the degree of concentration or convergence of the plasma arc 4, the melting boule 6
It is appropriate to measure the width W of . The concentration degree of the plasma arc 4 is controlled so that the width W of the melting boule 6 satisfies W≦5t, where t is the total thickness of the joining member, that is, the upper and lower resin laminated metal plates 1.2.

Further, in this case, since the end face of the resin laminated metal plate 1 is open to the outside, the decomposed gas of the resin layer 13 is exhausted by the shield gas injected from the plasma torch 3, and the decomposed gas of the resin layer 23 is This shielding gas and the high-speed plasma arc 4 that performs keyhole welding are discharged to the outside from the back surface. Therefore, welding defects due to these decomposed gases do not occur.

Figures 3 (a) to (d) show the welding results of various joints obtained by the above plasma welding method, and the cross-sectional shape of the weld bead with respect to the groove shape in the upper row is shown in the middle row. It is something. For comparison, welding results using a general covered arc welding method are shown in the lower row. Note that the welding conditions for (a) are a welding current of 1
5A.

Welding speed LoaIII/win, wire feed, ill,
5φ×15 cm/win, shield gas (A
r + 5%H2) 5ff/win, pilot gas (
A r) Ll! /ll1in.

For (b) to (d), the welding current was 19A.

Welding speed 10 cm/min, wire feed amount 1.5φ
X15 (to)/akin, and the gas conditions were the same as above. In addition, the welding conditions for covered arc welding are: (a) welding current 70A, welding speed 40cm/l1jn
, For (b) to (d), the welding current is 75A,
The welding speed was 40 am/akin. In the figure, 8 is a normal steel plate.

As is clear from FIG. 3, according to this method, satisfactory results were obtained for all joint types.

That is, according to this method, all welds and welds become through-beads, and it is possible to continuously obtain a good bead shape. Of course, it is also possible to form arbitrary beads intermittently. On the other hand, in covered arc welding, the bead does not penetrate due to the insulation effect of the arc heat due to the resin layer.
Furthermore, since a large amount of decomposed gas is generated from the resin layer, the arc becomes unstable and does not form a normal bead shape.

In addition, when using the conventional method (TIG welding) for laminated metal plates plated with Zn or Zn alloy, Zn
Defects such as blowholes may occur due to steam, and healthy beads may not be formed due to instability of the arc, but the method of the present invention has a high ability to discharge decomposed gas from the resin layer.
A healthy bead is formed without the above defects.

Note that the method of the present invention is not limited to the plasma arc welding method described above, but can be applied to all high-energy density welding methods such as TIG and MIG welding Norms arc welding, laser welding, and electron beam welding. It is something.

[Effects of the Invention] As described above, according to the present invention, by employing a high energy density welding method and by controlling the width of the molten pool to a predetermined value or less, it is possible to penetrate a resin laminated metal plate. Since a bead is formed and the welded joint is performed, all types of joints are possible, and the ability to discharge decomposed gas from the resin layer is high, making it possible to obtain an extremely good weld bead. . As a result, the use of resin-laminated metal plates can be expanded, and its practical value is extremely large.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the state of welding a resin-laminated metal plate by the plasma arc welding method according to the present invention, Fig. 2 is a longitudinal cross-sectional view of Fig. 1, and Fig. 3 (a) to (d) are welding conditions of a resin laminated metal plate by the plasma arc welding method according to the present invention. FIG. 3 is an explanatory diagram showing the welding results of the conventional method. 1.2...Resin laminated metal plate 11.12.21. j2... Metal plate 13.23... Resin layer 6... Melt pool agent Patent attorney Muneharu Sasaki Procedural amendment (method) 1. Indication of the case Japanese Patent Application No. 63-34063 2, Title of the invention Melting welding method for resin laminated metal plates 3, Person making the amendment Relationship to the case Patent applicant name (412) Nippon Koukan Co., Ltd. 4, Agent address Amita Building 5, 8-6 Toranomon 5-chome, Minato-ku, Tokyo. Date of amendment order: May 11, 1985 (Shipping date: May 31, 1988).

Claims (1)

[Claims] In the case of welding a resin-laminated metal plate, which is integrated by sandwiching a thin resin layer between two metal plates, to another resin-laminated metal plate or a normal metal member, plasma welding method; Pulsed arc welding method, laser welding method,
Alternatively, using a high energy density welding method such as electron beam welding, while controlling the width of the molten pool to 5t or less, where t is the total thickness of the joining member, under the supply of shielding gas or assist gas, A method of fusion welding resin-laminated metal plates, characterized in that the molten pool penetrates the entire thickness of the joining member for fusion welding.