JPS60238091A - High-frequency resistance welding method - Google Patents

Abstract

PURPOSE:To prevent the decrease in the fatigue strength in a weld zone by bringing a filler metal into press contact with the weld zone by means of a press roller having a positioning groove and cutting away successively the flash generated at the ends of the joint surface so that the filler metal is brought into press contact uniformly with the weld zone. CONSTITUTION:The press roller 15 having the hollow positioning groove on the circumferential surface is used in fillet welding, etc. The roller 15 is so set that the center line in the pressurizing direction of the roller 15 intersects at a prescribed angle with the line of intersection of materials 1, 2 to be welded. The filler metal 3 is fitted into the positioning groove of the roller 15 to position the metal 3 and to bring said metal into press contact with the weld zone 3'. The weld zone 3' is thus successively welded. A cutting means is moved integrally with the roller 15 to remove successively the flash generated at the ends of the joint surface of the metal 3 by each cutting blade 16. The appearance of the weld zone 3' is maintained without being spoiled and the decrease in the fatigue strength is prevented by the above-mentioned method.

Description

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

[Prior art]

Conventionally, when welding a filler metal to a welded portion of a material to be welded under pressure by high-frequency resistance welding, high-frequency resistance welding is performed using an apparatus such as that shown in FIG. 1, for example. In the same figure, (υ, (2) are the materials to be welded arranged in the horizontal and vertical directions, respectively, and (3) are the materials to be welded with both waves wound around the supply roll (1), (21 fillet welds ( 3) A filler metal with a triangular cross-section for redundancy to be joined to the welding part (3); A pressure roller with a flat surface serves as a pressure means, and the pressure roller (4) connects the unjoined filler metal (3) and the material to be welded (1).

(2) and the ■-convergence angle required for high-frequency resistance welding (the angle between the unjoined filler metal (3) near the joint and the welded materials (1) and (2)) The filling metal (3) is pressure-welded to the welding part (3)' so that

(5) is a high-frequency power source for welding consisting of a Sirinuta type high-frequency oscillator, +e+, (7) is a contactor connected to the high-frequency power source (5) via a matching board/output transformer 7 (8), respectively; The two contactors (6) are connected to the materials to be welded (1) and (2), and the other contactor (
7) is connected to the filling metal (3), and the high frequency current is applied to the welding material side.
[2J, flows through the path of the joint near the pressure rollers (4) and (7), the filling metal (3), and the filling metal side contactor (7), and is heated on that path due to the skin effect and proximity effect,
The filling metal (3) is pressed by the pressure roller (4) at the position where the temperature reaches the joining temperature.

In this case, since the cross-sectional area of the filler metal (3) is small and the materials to be welded (1) 1 (2) are large, even if the heat balanne collapses and the temperature of the filler metal (3) rises by In order to prevent the phenomenon that the temperature of the welding material (], ), (2) does not rise, the position 111 and the filling metal side are The distance to the contactor (7) is shortened.

Furthermore, in order to better maintain the P1-balanne, a preheating high frequency power source (9) consisting of a sirinuta type high frequency oscillator etc. is provided in the same way as the welding high frequency power source (5).
9) is connected to the preheating high frequency induction coil (11) via the matching board/output transformer 700, and the materials to be welded (1) and (2) are preheated by high frequency induction heating by the coil) v(II). Pressure roller (4), contactor +61, (7), :l/l/(]])
, matching board ° output 1 - Lannes (8), (IC1 is the first
They move together along the welding part (31') in the direction of the arrow in the figure.

Furthermore, as shown in Fig. 2, even if it is a butt weld (14) formed by butting the welded materials aa and aa, it can be welded in the same manner as the corner weld (31') in Fig. 1. be done.

Note that, in addition to the filling metal (3) having a triangular cross section as shown in FIG. 1, those having a circular cross section or a square cross section are also used.

However, when the filler metal (3) has a triangular or square cross section, the corners of the filler metal (3) itself cause the filler metal (
3) is pressed by the pressure roller (4) and the welded part (31'
.

(14), but if the filler metal (3) has a circular cross section, the pressure roller (4) has no grooves on its circumferential surface and is flat, so the filler metal (3) If there is a bend in the metal filler (3), as shown in Figure 3,
The cross-sectional center of the pressure roller (4) has shifted from the dashed-dotted line in the same figure, which indicates the center line in the pressure direction, and the filler metal (3) has slipped from its original position. When the filler metal (3) is pressurized as it is, one of the welded materials (1)
The filling metal (3) is welded only to the self-welded part (3).
There is a drawback that the bonding is biased toward ′.

Note that the shaded portion in FIG. 3 indicates the heating section.

Also, when the filling metal (3) is pressed against the welded part <3f, (+4), the cross-sectional shape of the filling metal (3) and the pressure roller (
Regardless of the shape of 4), as shown in Fig. 4(a) and (+)), the filling metal (3) bonded to the solution phase (1), (2) or 0, 03, respectively. Burrs (A) occurred at both ends of the joint surface of the welded parts (3) and (
14), and the fatigue strength of the welded portion (31', θ4) decreases.

[Purpose of the invention]

This invention was made with the above points in mind,
The purpose of the present invention is to facilitate the positioning of filling metal in a welded part and to easily remove burrs generated in the welded part.

[Structure of the invention]

This invention preheats a welding part of a material to be welded, joins a filling metal to the welding part, passes a high-frequency current from a high-frequency power source between the material to be welded and the filling metal, and Pressing the filling metal to the mI welding part using a pressure roller having a concave positioning groove, and cutting off burrs that occur at the end of the joint surface between the solution phase and the filling metal using a cutting means after the pressing. This is a high frequency resistance welding method characterized by:

〔Effect of the invention〕

Therefore, according to the high frequency resistance welding method of this invention,
The filling metal is pressed against the welded part by a pressure roller having a concave positioning groove on the circumferential surface, and the burr is cut off by a cutting means after the pressure welding, so that even if the filling metal has a circular cross section, the pressure roller The positioning groove makes it easy to position the filler metal, making it possible to press the filler metal to the welding area without biasing it as in conventional methods, and also making it easier to remove burrs that occur in the welding area after pressure welding. This is very practical as it prevents the appearance of the welded part from being damaged or the fatigue strength from decreasing due to its removal.

〔Example〕

Next, this invention will be explained in detail with reference to the drawings from FIG. 5 showing one embodiment thereof.

In FIG. 5, the same symbols as in FIG. 1 indicate the same things, and the difference from FIG. The point is that a cutting blade OQ for cutting a plurality of burrs (A, ) and a cutting means a having a built-in drive motor for each cutting blade 0 are provided behind the pressure roller 00.

When welding a corner weld <3f, before welding, as shown in the dashed line in FIG.
The center line in the pressure direction of (①) is the double-wave welded material (1).

(2) at a predetermined angle.
By setting 51, even if the cross-sectional center of the filler metal (3) deviates from the center line as shown in the same figure, the filler metal (3) will fit into the positioning groove of the pressure roller and fill. The cross-sectional center of the metal (3) is located on the center line, and the filler metal (3) is positioned, and the filler metal (3) is pressure-welded to the welded part (3f) to form the welded part (3).
' are welded in sequence.

Furthermore, prior to welding, as shown in FIG. Select a cutting blade 0→ that has a shape that follows the edge of the joint surface, and use cutting means 0.
'7) is set in a predetermined position in advance, the pressure roller 0υ can fill the welding part (3)' with filling metal (3).
After the pressure contact, the cutting means 0η moves together with the pressure roller 0■ in the direction of the arrow in FIG. are removed sequentially.

Also, when welding a butt weld Q4) as shown in FIG. 9 and FIG. By setting the cutting means 0'I) in respective predetermined positions, the welding portion 04) is welded.

Note that when the filling metal (3) has a triangular or square cross section, positioning is performed naturally depending on the shape of the filling metal (3) itself.

Therefore, according to the above embodiment, even if the filler metal (3) has a circular cross section, the filler metal (3) can be easily positioned by the positioning groove of the pressure roller αQ, and the filler metal (3) can be easily positioned. Welded part without biasing the metal (3)
3 (, Q → can be pressure welded, and after pressure welding, the cutting means α can be used to easily remove burrs that occur in the welded area
It is practical because it prevents damage to the appearance and decrease in fatigue strength.

Note that the positioning groove of the pressure roller θ■ may be V-shaped.

[Brief explanation of the drawing]

Figures 1 and 2 are perspective views during welding using the conventional high-frequency resistance welding method, Figure 3 is a front view for explaining the operation of Figure 1, and Figures 4 (a) and (b) are Figure 1. 2, a cutaway front view of the welded part after welding, and FIG. 5. The following drawings show an embodiment of the high frequency resistance welding method of the present invention, and FIG. 5 is a perspective view during welding, and FIG. 6 is a cutaway front view with the pressure roller in Fig. 5, Fig. 7(a), (1))
are respectively a front view of the cutting blade in FIG. 5 and a cutaway front view with the cutting means in place, FIG. 8 is a perspective view of the cutting means, FIG. 9 is a front view of the pressure roller in another state, and FIG. The figure is a cut front view of the cutting means in another state. (1) , (2) , (1 second, 03...material to be welded, (3)...filling metal, (3f. 04)...welding part, (15+...pressure roller, θ F...Cutting means. Agent: Patent attorney Ryutabe Fujita

Claims (1)

[Claims] ■ Preheating the welding part of the material to be welded, joining the filling metal to the welding part, passing a high-frequency current from a high-frequency power source between the material to be welded and the filling metal, and positioning a concave shape on the circumferential surface. The filling metal is pressed against the welding part by a pressure roller having a groove, and after the pressing, a cutting means is used to cut off burrs that occur at the end of the joint surface between the welded material and the filling metal. High frequency resistance welding method.