JPS61123478A - High frequency resistance welding method - Google Patents

Abstract

PURPOSE:To execute a good welding by cooling an undeposited part of a packing metal of the vicinity of a pressure roller, and reducing a temperature rise difference of a weld zone and the packing metal, in a device for welding with pressure by a roller the packing metal for the reinforcement of weld, to the weld zone of a material to be welded, and depositing both of them by a high frequency heating. CONSTITUTION:A packing metal 4 for the reinforcement of weld is welded with pressure by a roller 5 to a groove weld zone 3 of materials to be welded 1, 2, and both of them, are deposited by high frequency current heating appa ratuses 10, 13. In that case, a temperature of the packing metal 4 rises quickly by a sectional area difference, a good deposition cannot be executed. In this case, an undeposited part of the packing metal 4 of the vicinity is cooled by jetting and supplying a refrigerant such as a carbon dioxide gas, etc. from a through-hole 8 of the pressure roller 5. In this way, a temperature rise differ ence of both of them is reduced and a good welding is executed, and also the welding efficiency is improved by increasing a high frequency heating current.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a high frequency resistance welding method for press-welding and welding filler metal for extra buildup to a welded portion of a workpiece.

[Conventional technology]

Generally, when performing high frequency resistance welding using filler metal for extra layer, the filler metal for extra layer is joined to the welded part of the material to be welded,
A high-frequency current from a high-frequency power source is passed between the material to be welded and the filler metal for the extra layer, the material to be welded and the filler metal for the extra layer are heated to the weldable part, and the material to be welded is welded by a pressure roller. The filler metal for the extra layer is pressure-welded to the part.

At this time, the filler metal for the extra layer usually has a triangular cross section, and the V required for high frequency resistance welding - the convergence angle, that is, the predetermined angle formed by the filler metal for the extra layer near the pressure roller and the material to be welded. This makes it easy to obtain IC changes.

[Problem that the invention seeks to solve]

However, because the cross-sectional area of the filler metal for the reinforcement is much smaller than the cross-sectional area of the material to be welded, the heat capacity of the filler metal for the reinforcement and the heat capacity of the material to be welded are significantly different, and the excess is reduced due to the passage of high-frequency current. Only the temperature of the filler metal increases and the temperature of the material to be welded does not rise much, and before the temperature of the material to be welded reaches the temperature that allows pressure welding, the temperature of the filler metal for extra buildup exceeds the temperature that allows pressure welding. In order to prevent the filling metal for the reinforcement from fusing, first lower the current value of the high-frequency current so that the material to be welded does not reach the temperature at which pressure can be welded, and the metal will eventually melt. However, there is a problem that welding cannot be performed.

Conventionally, it has been considered to preheat only the material to be welded using another high-frequency power source, but this method is undeniably expensive.

[Means for solving problems]

In this invention, a filler metal for extra buildup is joined to a welded part of a material to be welded, a high frequency electric current of 11E is passed between the material to be welded and the filler metal for extra buildup, and a pressure roller is used to The welding part [high frequency resistance welding method in which the filler metal for extra layer is welded by pressure welding, the high frequency resistance welding is characterized in that an unwelded portion of the filler metal for extra layer is cooled in the vicinity of the pressure roller It's a method.

[Effect]

Next, to explain the operation of the present invention, in order to cool the unwelded part of the filler metal for extra metal near the pressure roller, even if a large high-frequency current is passed through, the material to be welded does not reach the temperature at which pressure welding is possible. The filler metal for extra heap will not melt.

〔Example〕

Next, drawings showing embodiments of the invention will be described.

First, FIG. 1 and FIG. 2 showing one embodiment will be explained.

In Figure @1, (1) j (2) is the two flat plates that are the materials to be welded, (3) is the V-shaped opening formed at the welded part of the ambidextrous plates (1) and (2), (5) is the filler metal for extra buildup with a triangular cross section that is fed out from the supply roll and joined to the groove (3) of the welding part, and (5) is the groove (3). 3) is a hollow pressure roller that comes into pressure contact with the groove wall of FIG. The pressure roller (5) is rotatably supported, and a plurality of through holes (8) are provided on the circumference j of the pressure roller (5), and the pressure roller (5) A vibrator (9) connected to the rotating shaft portion of the pressure roller (5) and communicating with the inside of the pressure roller (5).
A refrigerant such as carbon dioxide gas is supplied into the pressure roller (5) through the pressure roller (5), and the refrigerant is ejected through the through holes (8).

αQ is a high frequency power source consisting of a high frequency oscillator, αη, CL1
are the high frequency [
One of the two contactors Qυ is electrically contacted with the amphibious plates (1) and (2), respectively, and the other contactor (2) is connected to the source 011c.
is in contact with the filling metal (4), and the high frequency current from the power supply αQ is applied to the contactor Ql), the amphibious plate (1) t (2)
, the joint near the pressure roller (5), the filling metal r4),
It flows through the path of the contactor (b), and due to the skin effect and proximity effect, the amphibious plates (1) and (2) near the pressure roller (5)
) and filling gold 4(5)・'l; JQ heated.

At this time, the hood part (7) of the support body (6) is shaped so as to cover the upper half of the pressure roller (5) on the side opposite to the contactor □□□ side and on the contactor (2) side.
) inside the through hole (8) in the lower half of the contactor Q4 side.
) It looks like it's going to gush out.

Then, due to the high-frequency current from the high-frequency power supply αq, the filling metal (4) with a small heat capacity reaches a temperature at which it can be pressed together more than the amphibious plates (1) and (2), but the through-hole of the pressure roller (5) ( As the refrigerant ejects from 8) as shown by the arrow in Figure 1, the unwelded part of the filling metal f4) near the pressure roller (5) is cooled, so the filling metal ( 4) is prevented from fusing, and by increasing the output of the high-frequency power source aQ, the amphibious plates (1) and (2) can easily reach the temperature at which pressure can be welded without the filling metal 14) fusing.

Note that the welded part of the welded material may be a fillet welded part consisting of a flat plate J4j;j and an upright plate αO, as shown in FIG. During flow, due to the edge effect, the vertical plate αG is smaller than the flat plate α→
Since the temperature rises, a high-frequency current from another high-frequency power source α is passed through the induction heating coil αf9 through the matching plate and output transformer αη, and the flat plate α→ is preheated by the induced current from the coil αf9vc.

Also, filling gold! '4) The cooling means is the through hole (
8) is not limited to the refrigerant.

〔Effect of the invention〕

Therefore, according to the present invention, in order to cool the unwelded portion of the extra filler metal ffc4) near the pressure roller (5), the output of the high-frequency power source is increased without melting the filler metal/4). The material to be welded can be heated to a temperature that allows pressure welding, and the welding work can be interrupted due to melting of the filler metal (4), or the filler metal (4) can be heated due to insufficient heating of the filler metal (4).
It is possible to reliably prevent non-welding and the like, and the effect is very remarkable.

Furthermore, the material to be welded is a flat plate (1), (
In the case of 2), preheating means for the flat plates (1) and (2) becomes unnecessary, and costs can be reduced.

Further, the refrigerant can be effectively injected from the hood portion (7) VC of the support body (6) to the unwelded portion of the filling metal 14) in the vicinity of the pressure roller (5) for cooling.

4 The explanatory drawings shown in the drawings (=3, :1) show an embodiment of the high frequency resistance welding method of the present invention, FIG. 1 is a perspective view of one embodiment, and FIG. 2 (2)), (b)
1 is a side view and a sectional view of the pressure roller in FIG. 1, and FIG. 3 is a perspective view of another embodiment.

(11, (2) Tug 4... flat plate, (3)... groove, /, 4)... filling metal, (5)... pressure roller,
(8)...Through hole, αq...High frequency power supply, aυ...
Standing board.

Claims (1)

[Claims] (1) A filler metal for extra layer is joined to the welded part of the material to be welded, a high frequency current is passed between the material to be welded and the filler metal for extra layer by a high frequency power source, and a pressure roller is used to pass the filler metal for extra layer to the welded part. A high frequency resistance welding method in which the filler metal for the extra layer is welded by pressure welding, the high frequency resistance welding method comprising cooling an unwelded portion of the filler metal for the extra layer near the pressure roller.