JPS6363575A - Roll seam welding method - Google Patents

Abstract

PURPOSE:To perform the welding excellent in both airtightness and strength by using a doubling metal plate on the surface of the thinner plate side to position it almost at the center of the overall metal plate thickness and forming a nugget on contact parts at the time of performing the roll seam welding of two metal plates. CONSTITUTION:The thicker metal plate 11 has the thickness >=about three times as compared with the thinner metal plate 12. The doubling metal plate 13 is fitted on the surface of the thinner metal plate 12 by the fillet welding etc., and the thickness of the doubling plate 13 is made so that the total of the thickness of the doubling plate 13 and the thinner metal plate 12 is made to about >=1/2 and <=two times the thickness of the thicker plate 11. In this way, the doubling plate 13 is fitted on the thinner plate 12 and the welding is performed with the whole plates 11-13 between roll-shaped electrodes 14 and 15. In this way, the nugget 16 is formed on almost the central position of the thickness of the whole plates 11-13, namely, the contact parts of both the metal plates 11 and 12 and the metal plates 11 and 12 are welded to each other satisfactorily and the satisfactory welding in both the airtightness and the strength of a weld zone is obtained.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a roll seam welding method.

BACKGROUND OF THE INVENTION Conventionally, a roll seam welding method has been proposed as a method for welding a pair of metal plates together. In this welding, a pair of metal plates to be welded are sandwiched between a pair of rolled electrodes.

The problem to be solved by the invention, however, as shown in Figure 3, a pair of metal plates (1)
(2) If the difference in thickness is large, for example 1:3 or more, if this is sandwiched between roll-shaped electrodes (31 (4) and welded, a nugget ( 5
) is formed on the side of the thicker metal plate (1). As a result, a problem arises in that the airtightness and strength of the welded portion are unsatisfactory.

This means that the specific resistance of metal plates (1) and (2) is nugget (
It is thought that this is because a nugget (5) is formed near the center of the metal thickness of the two metal plates (1) and (2) to be roll seamed. For this reason, in the past, the limit for plate thickness difference in roll seam welding was usually set at 1:3, and the reality is that roll seam welding of plates with a thickness difference greater than this is not normally performed. .

Therefore, the present invention solves these problems and reduces the plate thickness difference by 1:
It is an object of the present invention to enable excellent roll seam welding of three or more metal plates.

Means for Solving the Problems In order to solve the above problems, the present invention provides that when two metal plates of different thickness are roll-seam welded, a metal splint is attached to the surface of the thin plate. The contact part of both metal plates,
It is located approximately at the center of the total thickness of the metal plate including the splint plate.

By doing this, it is possible to form a nugget at the contact portion of the two metal plates to be roll-seam welded, making it possible to perform welding that is satisfactory not only in terms of airtightness but also in terms of strength.

Embodiment In FIGS. 1 and 2, C11) C2 are two metal plates to be roll seam welded, and the thicker metal plate αυ
- has a thickness more than three times that of the thinner metal plate @. A metal splint is attached to the surface of the thinner metal plate by fillet welding or the like. The thickness of this splint α3 is the sum of the thickness of this splint α] and the thinner metal plate @, which is the thickness of the thicker metal plate a
It is preferable to set the thickness to be at least one-half and at most twice the thickness in degrees Celsius.

In this way, attach a splice plate α:1 to the thinner metal plate 0δ,
All plates α1)a2Q3 are rolled electrodes Q4)O5
Weld by sandwiching it between the two. Then, as shown in Figure 2,
A nugget) M is formed at a position approximately at the center of the thickness of all the plates 0υa2aa, that is, at a contact portion between both metal plates α])C12.

As a result, the metal plates are well welded together, and the welded portion has satisfactory airtightness and strength.

Next, specific examples of the present invention will be explained in detail.

<Specific example 1> JIS SUS 304 stainless steel &' (r- is used as the metal plate α, 11Q2, and the thickness of the thicker metal plate αυ is t.
, olllN, the thickness of the thinner metal plate (2) is 0.3n
And so. Table 1 is based on the conventional welding method and shows the welding conditions at the limit of dust generation when the splint (2) is not used. Table 2 shows welding conditions when splint plate 03 is used based on the welding method of the present invention.

- Below margin - Table 1 Table 2 In this way, if there is no splint, the nugget will be biased toward the thick plate, and the thin plate will be pressed against the nugget (see Figure 4). On the other hand, when a splint is used, a nugget is formed at the contact area between the two metal plates, resulting in a sound weld (see FIG. 2).

<Specific Example 2> A JIS 5US304 stainless steel plate was used as the metal plate αυα, and the thickness of the thicker metal plate Ql) was [1g11,
The thickness of the thinner metal plate is 0.2. It was set as WM. Table 3 shows the welding conditions at the limit of dust generation when using the conventional method without using the splint U3, and Table 4 shows the welding conditions when using the method using the splint of the present invention. It is.

Table 3 Table 4 In this way, if there is no splint, the nugget will be biased toward the thick plate, and no nugget will be formed at the contact area between the thick plate and the thin plate. On the other hand, when a splint is used, sound welding is performed as in the case of Table 2.

Effects of the Invention As described above, according to the present invention, the contact portion of two metal plates to be welded is located approximately at the center of the total thickness of the metal plates by using a splint plate. The formation of a nugget in the VJ movie theater was a sign of confidentiality,
Recycling is achieved by welding with excellent strength.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the welding part in one 46th example of the Nyorori seam welding method of the present invention, Fig. 2 is a sectional view of the welding part, and Fig. 3 is a sectional view of the welding part in the conventional roll seam welding method. 4 is a cross-sectional view of the welded portion. αυ(2)...Metal plate, 03...Splicing plate, (141
(15-... Electrode. Agent Yoshihiro Morimoto Figure 1 Figure 2

Claims (1)

[Claims] 1. When roll seaming two metal plates of different thickness, a metal splint is attached to the surface of the thin plate, and the contact area between the two metal plates is connected to the entire metal plate including the splint. A roll seam welding method characterized by positioning the seam approximately in the center of the thickness.