JPS58199688A - Welded structure - Google Patents

Abstract

PURPOSE:To provide a welded structure which secures the growth of weld beads thoroughly, by providing bridging parts of the size at which said parts melt easily upon receiving welding heat in the proper places in a welding gap thereby indexing the welding gap between members exactly. CONSTITUTION:The 2nd member 22 of a thin steel sheet or the like opened with slit-like welding holes 23 which are opened longitudinally to allow bridging parts 24 to remain is superposed and disposed on the 1st member 21 of a thin steel plate or the like. The parts 24 are beforehand determined at such a size at which the parts are penetrated integrally into weld beads 25 by the welding heat in the stage of welding work. Both members are welded continuously with a welding torch which is moved along the longitudinal direction of the holes 23. The size of the gap in the weld zone is maintained exactly and the non-defective product having good reliability is welded continuously according to such welded construction. Said construction is suitable for production of a silencer or the like for a vortex flow blower.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding structure for continuously welding overlapping parts of at least two members by arc welding or gas welding.

In structures where at least two members are welded, 1
As assembly work and welding work are automated, spot welding, which does not require high positioning accuracy, is often used because it is difficult to align each member.

An example of this flexible structure will be explained with reference to FIGS. 1 to 3. This example shows a muffler for a vortex blower. That is, iI! ! Figure 1 shows the overall configuration of a vortex blower, and 100 is a driving electric motor.

101 is a blower casing connected to the outer frame of the electric motor.

103 is an impeller placed inside the blower casing 101;
103 is a cage cover that closes the air blower casing 101t; 104 is a silencer placed at the bottom of the electric @ 100; one end is equipped with a connection port 105 for piping connection; the other end is connected to the air passage inside the air blower casing 101. are doing. Next, the structure of the silencer 104 will be explained in more detail with reference to FIGS. 2 and 3. 1 is a flat base plate, 2 is a pair of side plates bent into an L shape, and 5 is a partition plate placed in the center of the base plate 1. By combining these plates, two ventilation channels are created on the base plate 1. X and Y are formed. Reference numeral 4 denotes a mounting plate that closes the opening ends ft of each of the two ventilation passages X and Y, and has a ventilation hole 5 in the center.

Reference numeral 6 designates a through hole drilled in the base plate 1 for attaching the vortex blower, and 7 designates a through hole drilled in the bent portion 8 of the side plate 2 overlapping with the base plate 1, which also overlaps with the through hole 6. Reference numeral 9 indicates a through hole drilled in the upper surface of the side plate 2 for arranging a silencer at the bottom of the electric motor [100], and reference numeral 10 indicates a through hole drilled in the mounting plate 4 to which a connection port 105 for connecting piping is attached. It is for.

Next, the assembly procedure of this silencer will be explained.

First, the partition plate 3'lt is placed in the center of the base plate 1.

An elastic body 12 is sandwiched in advance at the overlapping portion of the bent portion 11 of the partition plate 3 and the base plate 1.

This overlapping portion is in contact with spot Ifl. Next, the side plate 2 is placed on the base plate 1. The opposing end surfaces of the side plates 2 are arranged so as to overlap on the other bent portion 14 of the partition plate S with a slight gap 15t left open. An elastic body 12 is sandwiched between the bent portions 8 of the base plate 1 and the side plates 2, and the overlapping portions are spot welded. Next, side plate 2
A welding torch is directed toward the mutual gap 13, and the bent portion 14 of the partition plate 3, the [1 plate 2, and the side plates 2] are continuously welded to each other. Finally, the mounting plate 4 is placed at the openings of the two ventilation paths X and Y, and the surroundings of the mounting plate 4, that is, the mounting plate 4 and the base plate 1. A welding torch is continuously welded to the butt points between the mounting plate 4 and the side plate 2.

By configuring the muffler in a box shape using a combination of thin metal plates in this way, the sound absorbing area (passage area) can be increased, resulting in a muffler that is lighter and has a higher sound absorption effect than a muffler with a cast metal backing. be able to. However, such a welding structure requires a combination of spot welding and continuous welding using arc or gas welding, which complicates the welding procedure. In particular, spot welding allows the welding work to proceed without requiring high alignment accuracy, and is convenient for automating assembly work, but when arc or gas welding is used, the gap size between the parts 13 Alternatively, unless this position is accurately determined, the welding work cannot be carried out safely and reliably. Also, when manufacturing a pressure vessel such as a silencer by spot welding, each member must be completely sealed.

It is necessary to attach the elastic body 12 to each overlapped portion, and the process of attaching the elastic body is troublesome.

Therefore, if continuous welding by arc or gas welding is used, there is no need to sandwich the Y-A/material between the overlapping parts of each member, and industrial robots suitable for such welding work have become popular in recent years. Using this, welding work and
As assembly work becomes more automated, the use of continuous arc or gas welding is being reconsidered. In this way, when proceeding with the automation of welding work or assembly work, the most important issue is how to maintain high accuracy in the combination of welded parts in order to proceed with the welding work safely and reliably. In other words, when using industrial robots, there is a limit to improving the stopping accuracy of the robot arm and the dimensional accuracy of the parts to be assembled. It is necessary to use a welded structure that can determine the

That is, the present invention aims to accurately determine the welding gap between each member and ensure sufficient growth of the weld bead when performing continuous welding of overlapping parts or butt parts by arc or gas welding, etc., which have a high sealing effect. The present invention provides a welded structure that can produce highly reliable welded products.

In other words, in order to accurately determine the size of the welding gap at the welding location where continuous welding is performed during the welding process, the present invention provides a bridging part at an appropriate location in the welding gap, and adjusts the size of this bridging part to the weld bead after welding work. The size is chosen so that it will easily melt when it receives the welding heat so that it will penetrate and become one with the welding heat.

A basic embodiment of the present invention will be described below with reference to FIGS. 4 and 5. FIG. 4 is a partial sectional view showing the structure of the pressure vessel created according to this example, #! FIG. 5 is a process chart for explaining the welding process. first.

The case according to the AB process of the embodiment will be explained. 21 is a first member, which is a flat thin steel plate cut into the required dimensions, and 22 is a second member, which is a thin steel plate stacked on the first member 21 and cut into the required dimensions. can be,
A slit-shaped welding hole 23 is opened in the first member 21 leaving a bridging portion 24 in the longitudinal direction. This welding hole 23 is preferably punched out in advance by press working. When the two members 21 and 22 are placed one on top of the other as shown in the middle of Figure s5, and continuous welding is performed by moving the welding torch along the longitudinal direction of the welding hole 25, welding is performed at B in Figure 5. As shown, the dimensions of the bridging part 24 are determined in advance so that the bridging part 24 is melted and integrated into the weld bead 25 by the welding heat during the welding operation.

Next, a case using the 0-D-B process of the embodiment will be explained. This is made by cutting a cylindrical steel plate to the required size for the first member 21 made of rolled steel plate. 3 members 26 are stacked and placed, and this #! The bridging portion 2 is attached to the end surface 27 of the member 26 of No. 3.
8, the bridging portion 28 is provided so that the tip of the second
The members 30 are stacked and arranged on the first member 21.

That is, the welding groove 29 is provided by cutting out the end face of the second member 30 that faces the end face 27 of the third member 26 stacked on the first member 21 , and the welding groove 29 is cut out from the end face of the second member 30 . The remaining portion may be used as the bridging portion 28.

As shown in FIG.
The welding torch is moved along the longitudinal direction of the welding groove 29 to perform continuous welding. At this time, as already explained, the size of the bridging part 28 is set so that it melts into the weld bead 25 and becomes integral with it, and so that the gap size of the weld groove 29 is maintained appropriately.
It goes without saying that the dimensions should be determined in advance.

With such a welding structure, welding hole 23 or welding groove 2
When continuous welding is performed along the longitudinal direction of 9, the bridging portion 2
4.28 is of course the wall surface of the welding hole 23 and the end surface 27 of the third member 26 facing the welding groove 29, as well as the welding hole 2.
6. First member 2 open to welding #129
A part of the surface of 1 is melted and welded together. Therefore, the sea/l/fabric of the welded portion is perfect, which makes this welded structure Fi especially effective when manufacturing a container or a pressure vessel. An example of a pressure vessel manufactured in this manner will be briefly explained in the fourth drawing. 121 is a first member formed into a cylindrical shape and serves as a reinforcing member; 126fd is a third member expanded to fit into the outer surface of the first member 121; 130 is a second member; Similar to the member !3, the opening end is expanded, and a welding groove 129 is provided in a portion of the third member 126 facing the end surface 127, leaving a bridging portion 128. When the structures configured in this way are fitted together as shown in the figure, welding occurs at the height of the bridge section 128.
1129 gap dimensions are defined. Therefore, by moving the welding torch along the welding groove 129 defined to have an appropriate gap size and welding this portion, a pressure vessel with a complete pressure seal can be obtained. In addition, 12
5 shows a weld bead after welding work.

Next, an example in which the present invention is implemented to produce a combined sound deadening device by bending plate materials will be described with reference to FIGS. 6 to 12. First, FIGS. 6 and 7 show the overall structure of the silencer. That is, reference numeral 301 is a base plate, which is integrally provided with a bent portion 302 by extending two opposing sides, which are punched out from a single steel plate, and after punching, the bent portion 302 is bent in the same direction. 505 is bent! 3 (through hole drilled in 12, 504\i screw hole provided in bent part 502, for attaching connection port 105 for piping connection. 305 doubles the space between both bent parts 302. A partition plate 506 is a side plate that covers the base plate 301b and the partition plate 305, and is punched out from a single steel plate, bent into a U-shape as a whole, and then bent at the open end outward to form a bent part 307.

508 is a through hole opened in the bent portion 307, and 3o9 is a running hole opened in the base plate 301.

309 is in the same positional relationship when the bent portions 307 are stacked on the base plate 501, and is used when fixing the silencer to other members. Reference numeral 510 is a through hole made in the side plate 506 and is used for attaching the electric motor 100. Now, the structure and assembly procedure of such a silencer will be explained in more detail.

8 and 9 show the relationship between the base plate 301 and the partition plate 305, and the end surface of the partition plate 3050 on the pace plate 301 side has a protrusion 31 provided to protrude from the base plate 301.
1 is used for positioning. When the positioning of the partition plate 305 is completed, the welding torch is moved along the abutting area between the end face of the base plate 301a of the partition plate 305 and the base plate 2, and this abutting area is continuously welded. moreover,
The welding torch is moved along the abutting point between the end surface of the partition plate 302 on the side of the bending section 302 and the bending section 502, and this abutting point is continuously welded. A side plate 506 shown in FIG. 11 is further welded to the semi-finished product assembled in this way (as shown in FIG. 8).

That is, a slit-shaped welding hole 312 is provided in the center of the side plate 306, leaving a bridging portion 313. This welding hole 31
2 selects a position where the side plate 506 is opened so as to overlap the bent portion 514 of the partition plate 305 when the side plate 506 is covered with the base plate 501. 515 is a slit-shaped welding hole opened in the side plate 506 leaving the bridging part 316, and is arranged along the bending part of the bending part 307. Missing weld holes like this.

315 can be punched out by press working.

After the side plate 306 provided with the welding holes 512 and 515 is covered with the base plate 301, a welding torch is moved along the welding holes 312 and 315, and these parts are successively welded. Furthermore, the welding torch is moved along the abutting point between the end of the side plate on the side of the bent portion 302 and the bent portion 302, and this abutting point is continuously welded to complete the silencer.

With such a welded structure, the overlapping of each member and the butt joint can be continuously welded by arc welding, gas welding, etc., and each part can be reliably sealed. Further, since some of the welding holes 315 are provided along the bending part, the bending work of this part becomes easy.

Continuing the explanation, as shown in Figure 10,
Protrusions are provided on the end surface of the partition plate 3050 on the base plate 301 side,
An example is shown in which the base plate bent portion 307 is constructed from a separate member by providing a through hole 318 on the base plate 501 side to receive this protrusion and engaging the end face of the partition plate 305 with this through hole 318. This connects the bridging portion 51 toward the end surface of the side plate 306.
Prepare an auxiliary plate 320 provided with a groove 9, and butt this auxiliary plate 320 against the end surface of the side plate 606 on the base plate 301 side, and move the welding torch along the welding groove 321 provided in this butt part. This involves continuous welding. As shown in FIG. 13, such an auxiliary plate 320 may be formed by partially pressing one side of the plate material and extruding it to the outside to provide a bridging portion 519.

In addition, in the example of the silencer explained above at least 1, the bending part 307 which continues to a connection part, or the auxiliary board 520 works as a reinforcement material of a silencer.

As is clear from the above description, in order to accurately determine the dimensions of the weld gap at welding points where continuous welding is performed during the welding process, the present invention provides a bridging portion at an appropriate location of the weld gap in a welded structure with a weld gap. The size of this bridging part is selected to be such that after welding work, it melts into the welding bead and is easily melted by the welding heat so that it becomes integral with the welding bead. Therefore, according to the welding structure of the present invention, the gap size of the welded portion can be maintained accurately, and continuous welding of good quality products with high reliability can be performed.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a vortex blower manufactured using the present invention;
Figure #12 is a diagram showing a muffler for a vortex blower manufactured using a conventional welded structure, Figure 5 is a diagram for explaining the manufacturing process of the muffler shown in Figure 2, and Figure 4 is a welded structure of the present invention. Fig. 5 is a diagram illustrating the basic structure of the welded structure of the present invention, and Fig. 6 is a partial cross-sectional view illustrating the pressure melter manufactured using the welded structure of the present invention. Figures 7 and 8 are diagrams for explaining the assembly process of the silencer shown in Figure 6. Figures 9 and 10 are the penis plate and partition plate of the silencer. Figures 11 and 12 are diagrams to explain the details of the side plate of the silencer, and Figures 1.3 and 3 illustrate an example of the process of creating the bridging part of the welded structure. This is a diagram for 21.301,314...First member, 22,50°306.520...Second member, 26...Third member, 25.512,515...Welding hole, 24. 28,
313゜316.519... Bridging department, 29,321
...Welding groove. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 8 Figure 11 Figure I3

Claims (1)

[Scope of Claims] t A first member; a second member provided with a welding hole that opens leaving a bridging portion in the longitudinal direction of the first member and is placed over the first member; In a structure consisting of
A welded structure characterized in that when welding is performed along the longitudinal direction of the weld hole of the second member, the size of the bridging portion is selected to be large enough to melt due to welding heat during the welding operation. 2. A first member comprising a first member, a third member disposed overlapping the first member, and a welding groove facing the end face of the third member and opening in the longitudinal direction leaving a bridging portion. When welding is performed along the longitudinal direction of the welding groove of the second member in a structure consisting of a second member placed overlapping the second member, the size of the bridging portion is determined by the welding heat during the welding work. A welded structure characterized by being chosen to be large enough to melt.