JPH0636990B2 - Welding method with damping steel plate - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a welding method used when welding a damping steel plate and another steel plate located above the damping steel plate by plug welding at the time of repair or the like.

[Conventional technology]

Usually, at the time of repair, the defective part is removed and reassembly is carried out by welding.However, even if the part was attached by spot welding at the time of regular assembly, the spot gun is inaccessible due to the plate assembly at the time of repair and spot welding is performed. It is often not possible and must be attached by another welding method, for example plug welding. Such an example can be seen when a damping steel plate is welded to a steel plate member such as an automobile body by applying a damping steel plate from the lower side to form a plug hole in the steel plate member and performing plug welding from the upper side. To be Further, arc welding of a damping steel plate and a steel plate member, plug welding is found in JP-A-60-87980 and JP-A-60-3982, but as in the present invention described below, CO _No method is disclosed for performing arc spot welding on the vibration-damping steel sheet prior to _2- plug welding.

[Problems to be solved by the invention]

However, if a damping steel plate made of a laminated plate in which a resin is sandwiched between the upper and lower plates is attached to the steel plate member by ordinary CO ₂ plug arc welding, as shown in FIG.
Since only the upper plate 1a side is welded and the lower plate 1b does not work as a strength member, there is a problem that the welding strength (shear strength) is significantly reduced.

Further, as shown in FIG. 4, there is also a method in which the portion corresponding to the plug hole 3 is mounted on the damping steel plate upper plate 1a for plug arc welding, but it takes a lot of man-hours to mount the upper plate 1a. and, or vines and the resin layer 1c is a problem that affect bad from the resin layer 1c and the organic gas is ejected CO ₂ plug welding at CO ₂ welding so would be exposed to the inner surface of the plug hole 3 comes out.

An object of the present invention is to improve the welding strength when welding a damping steel plate and a steel plate positioned above it by plug arc welding.

[Means for solving problems]

According to the present invention, the above-mentioned problems can be solved or reduced by the following welding method with the vibration damping steel plate. That is, when plug-welding the damping steel plate with resin sandwiched between the upper and lower plates and the steel plate located above it at the time of repairing, etc., first use the plug hole of the steel plate to perform arc spot welding on the damping steel plate and control it. The upper plate and the lower plate of the vibration-damping steel plate are fused together, and then plug arc welding is performed between the steel plate and the vibration damping steel plate to fill the plug hole and weld the steel plate and the damping steel plate upper plate. Welding method with characteristic damping steel sheet.

[Action]

In the above-described method of the present invention, since the steel sheet has a plug hole, the hole is first utilized to perform arc spot welding on the damping steel sheet. As a result, the upper and lower plates of the vibration damping steel plate are integrated by the arc spot welding nugget at or near the portion to be plug-welded next. Next, plug welding is performed between the damping steel plate in which the upper and lower plates are integrated and the steel plate.However, when the steel plate is welded to the upper plate of the damping steel plate, damping is performed via a nugget by spot welding. It is also connected to the lower plate of the vibration plate, and the welding strength is improved to the same level as the spot welding strength during regular assembly. Moreover, since the intermediate resin layer is not exposed, there is no adverse effect on CO ₂ plug welding due to the ejection of organic gas from the intermediate resin layer.

〔Example〕

A preferred embodiment of a welding method with a vibration damping steel plate according to the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows a state where arc spot welding is being performed in the first step of the method of the present invention. 1 is damping steel plate, 2
Is a steel plate located on the upper side (for example, a steel plate member for a vehicle body side component). The damping steel plate 1 is made of a laminated plate having a resin 1c sandwiched between an upper plate 1a and a lower plate 1b, and the upper plate 1a and the lower plate 1b are made of steel. The steel plate 2 has a plug hole 3 for carrying out a CO ₂ plug arc welding in a _second step described later. By utilizing this plug hole 3, the vibration damping steel plate 1 is subjected to arc spot welding at substantially the center of the plug hole 3. 4 is an arc welder, and a commercially available CO ₂ arc welder can be used. 5 is a wire, and the wire 5 is set with aiming at the center of the plug hole 3. Although 6 is a gas cup, CO ₂ gas is not required during arc spot welding. The arc spot welding is performed at a low current of 80 to 90 A and a voltage of 19 V for 1 second, and a nugget 7 is formed between the upper plate and the lower plate to obtain a spot welding strength (luma B class) at the time of regular assembly. Try to guarantee.

Next, in a second step of the present invention shown in FIG. 2, CO ₂ plug arc welding is performed between the steel plate 2 and the upper plate 1a of the vibration damping steel plate 1 in which the upper and lower plates are integrated by the nugget 7. Then, while blowing CO ₂ gas, the plug hole 3 is welded to the metal 8
And plug weld them together. CO ₂ may be another inert gas. For this plug arc welding, the same commercially available CO ₂ arc welding machine as in the first step can be used. Since the shear strength with respect to the diameter of the plug hole 3 is roughly as shown in Table 1 below, for spot welding strength of the luma B class of the first step, if there is a plug hole diameter of about 7 mm or more, I know it's good.

The arc spot welding and plug welding as described above can be used even when the spot welding cannot be performed by the spot gun during regular assembly due to the plate assembly, that is, even when the spot gun cannot be used for reassembly during repair. It can be used and expands the range of application to welded structures during repair. Moreover, even if one of the members to be reassembled is the vibration damping steel plate 1, since the vibration damping steel plate 1 is subjected to arc spot welding prior to plug welding, sufficient welding strength can be obtained.

〔The invention's effect〕

 According to the present invention, the following effects are obtained.

(B) Arc spot welding and plug arc welding can be performed with one commercially available CO ₂ arc welding machine, and normal CO ₂
A person who can perform welding can perform the welding without requiring special skill and can provide stable welding strength.

(B) It is possible to obtain welding strength comparable to the spot welding strength during regular assembly.

(C) Since the resin of the damping steel plate is not exposed in the plug hole, there is no adverse effect on CO ₂ plug arc welding due to the ejection of organic gas from the resin layer.

(D) Since the steel plate is located on the damping steel plate, it can be applied to a portion where ordinary spot welding cannot be performed, and can be widely applied as a welding method at the time of repair.

[Brief description of drawings]

1 is a cross-sectional view of the vicinity of a damping steel plate showing a state where arc spot welding is being performed in the first step of the method for welding a damping steel plate according to the present invention, and FIG. 2 is a damping steel plate according to the present invention Fig. 3 is a cross-sectional view of the vicinity of the damping steel plate showing the state where the plug arc welding of the second step of the welding method is performed, and Fig. 3 shows the vicinity of the damping steel plate showing the plug welding of the conventional damping steel plate and the steel plate. FIG. 4 is a cross-sectional view, and FIG. 4 is a cross-sectional view in the vicinity of the vibration damping steel plate in a state where plug arc welding is performed by taking the upper plate of the conventional vibration damping steel plate. 1 ... Damping steel plate 1a ... Upper plate 1b ... Lower plate 1c ... Resin layer 2 ... Steel plate (located on the damping steel plate) 3 ... Plug hole 4 ... Arc welding machine 5 ... Wire 7: Nugget 8: Weld metal (for plug welding)

Claims (1)

[Claims] 1. When plug-welding a damping steel plate having a resin sandwiched between the upper and lower plates and a steel plate located above it at the time of repair, arc spot welding is first performed on the damping steel plate by using the plug hole of the steel plate. The upper plate and the lower plate of the damping steel plate are fused together, and then plug arc welding is performed between the steel plate and the upper plate of the damping steel plate to fill the plug hole and weld the steel plate and the upper plate of the damping steel plate. A method of welding with a vibration-damping steel plate, characterized by: