JPH06218545A - Method for forming cladding part by welding for laminated structure - Google Patents

Abstract

PURPOSE:To prevent the occurrence of cracking by forming seal weld parts by laser beam welding or electron beam welding on a place where a cladding part by welding between respective members contiguous to each other is to be formed and then, forming the cladding part by welding to extend in the member laminating direction. CONSTITUTION:In the case of fitting a primary side fluid header to a core part 8, laser beam welding or electron beam welding is performed on the place where the cladding part 10 by welding between primary fluid side side-bars 4 and secondary fluid side side-bars 5 contiguous to each other via separate plates 1 is to be formed. The seal weld parts 12 to join integrally the primary fluid side side-bars 4 and the secondary fluid side side-bars 5 including the separate plates 1 are formed. Consequently, cracking does not occur by penetration of brazing filler metal into these seal weld parts themselves and since the cladding part 10 by welding is formed after the seal weld parts 12 are formed, penetration of the brazing filler metal is prevented for the cladding part 10 by welding and cracking does not occur on the cladding part 10 by welding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a weld overlay on a laminated structure.

[0002]

7 to 9 show the structure of a header mounting portion of a plate fin type heat exchanger, in which 1 is a plurality of separate plates having a flat plate shape and arranged at substantially equal intervals,
Reference numeral 2 denotes a plurality of primary fluid-side fin plates each having a corrugated plate shape and arranged so as to come into contact with the separate plates 1 every other space formed between the separate plates 1 and 1. 3 has a corrugated plate shape in which the groove extending direction is different from the primary fluid side fin plate 2 by about 90 °, and is provided in the space between the separate plates 1 and 1 in which the primary fluid side fin plate 2 is not provided. 1 is a secondary fluid side fin plate which is arranged so as to abut on the primary fluid side plate 1, and the primary fluid side fin plate 2 and the secondary fluid side fin plate 3 are fixed to the separate plate 1 by brazing. There is.

Reference numeral 4 extends along the non-corrugated end of the primary fluid side fin plate 2 and
The rectangular rod-shaped primary fluid-side side bars 5 fixed to the separate plates 1 and 1 which are in contact with each other extend along the non-corrugated end of the secondary fluid-side fin plate 3 and the secondary fluid-side fins. The plate 3 is a square rod-shaped secondary fluid-side side bar fixed to the separate plates 1 and 1 with which the plate 3 is in contact, and the primary fluid-side side bar 4 and the secondary fluid-side side bar 5 are spots, respectively. It is fixed to the separate plate 1 by welding.

Reference numeral 6 denotes a primary fluid flow path formed by the adjacent separate plates 1 and 1 and the primary fluid side fin plate 2, and 7 is formed by the adjacent separate plates 1 and 1 and the secondary fluid side fin plate 3. Is a secondary fluid flow channel, which includes the separate plate 1, the primary fluid side fin plate 2, the secondary fluid side fin plate 3,
The primary fluid side bar 4 and the secondary fluid side bar 5 form a core portion 8.

In the core portion 8 having the above-described structure, when the primary fluid is passed through the primary fluid passage 6 and the secondary fluid is passed through the secondary fluid passage 7, the separate plate 1 and the primary fluid side fin plate 2 are provided. The heat exchange is performed between the primary fluid and the secondary fluid via the secondary fluid side fin plate 3.

A primary fluid side header 9 is attached to the core portion 8.
When mounting, at the end face where the non-corrugated end of the primary fluid side fin plate 2 of the core part 8 is located, the separate plate 1, the primary fluid side bar 4 and the secondary fluid side bar 5 The build-up welded portion 10 formed of weld beads extending in the stacking direction is formed by means such as TIG welding, and the edge of the primary fluid side header 9 is fixed to the build-up welded portion 10 by means such as TIG welding. There is.

In FIG. 9, reference numeral 11 denotes an attachment weld portion for fixing the primary fluid side header 9 to the overlay weld portion 10.

[0008]

However, when the above-mentioned build-up welded portion 10 is formed, the brazing material that brazes the separate plate 1 and the primary fluid side fin plate 2 or the secondary fluid side fin plate 3 together. Weld overlay 10
When a large amount of metal melts into the weld metal, cracks may occur in the build-up weld 10 due to the penetration of the brazing material.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to prevent cracks due to penetration of a brazing filler metal from being generated in a weld overlay.

[0010]

In order to achieve the above object, in the method for forming a weld overlay of a laminated structure according to claim 1 of the present invention, a plurality of members are laminated and adjacent members are mutually adjacent. In the end face of the laminated structure fixed by brazing except the vicinity of the end surface predetermined position of each member, when forming a build-up weld portion extending in the member stacking direction through the end surface predetermined position of each member, After forming a seal weld by laser welding or electron beam welding at a place where a build-up weld between adjacent members is to be formed, a build-up weld extending in the member stacking direction is formed.

Similarly, in the method for forming a weld overlay on a laminated structure according to the second aspect of the present invention,
A member stacking direction is formed by passing a predetermined position on the end face of each member to the end face of a laminated structure in which a plurality of members are stacked and the surfaces of adjacent members that abut each other are fixed by brazing except near the predetermined position on the end face of each member. When forming a weld overlay that extends to, after forming a seal weld by laser welding or electron beam welding after interposing a filling member at the place where the weld weld between adjacent members should be formed Forming a build-up weld portion extending in the member stacking direction.

[0012]

In any of the methods for forming a weld overlay on a laminated structure according to the first and second aspects of the present invention,
Laser welding or electron beam welding with high energy convergence density is performed at the place where a weld overlay is to be formed between adjacent members, and a seal weld that prevents the elution of brazing filler metal is formed. The brazing material does not melt into the welded part, and cracks do not occur in the weld overlay.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show an example of the structure of a header mounting portion of a plate fin type heat exchanger to which the overlay welding portion forming method for a laminated structure of the present invention is applied, and FIGS. Portions with the same reference numerals represent the same items.

When attaching the primary fluid side header 9 to the core portion 8, the overlay welding portion 10 between the primary fluid side bar 4 and the secondary fluid side bar 5 which are adjacent to each other with the separate plate 1 interposed therebetween. Laser welding or electron beam welding is performed on the place where the seal fluid is to be formed to form a seal weld portion 12 that integrally joins the primary fluid side bar 4 and the secondary fluid side bar 5 including the separate plate 1 described above. To do.

Laser welding or electron beam welding is TI
Since the energy convergence density is higher than that of G welding or the like, when forming the seal weld 12, the brazing filler metal that brazes the separate plate 1 and the primary fluid side fin plate 2 or the secondary fluid side fin plate 3 is formed. Since the heat effect is small and the brazing filler metal is less likely to penetrate into the seal weld 12, the seal weld 12 itself is not cracked.

After the seal weld 12 is formed, the separate plate 1, the primary fluid side bar 4, the secondary fluid side is formed on the end surface of the core portion 8 where the non-corrugated end portion of the primary fluid side fin plate 2 is located. A build-up weld portion 10 made of weld beads extending in the stacking direction of each member of the side bar 5 is formed by means of TIG welding or the like, and the edge of the primary fluid side header 9 is TIG welded to the build-up weld portion 10. It is fixed by such means.

When the above-mentioned build-up welded portion 10 is formed, the brazing material brazing the separate plate 1 to the primary fluid side fin plate 2 or the secondary fluid side fin plate 3 is melted by the influence of TIG welding. However, the seal welding portion 12 prevents the brazing filler metal from penetrating into the build-up welding portion 10, and therefore, no crack is generated in the build-up welding portion 10 due to the penetration of the brazing filler metal.

4 to 6 show another example of the structure of the header mounting portion of the plate fin type heat exchanger to which the overlay welding portion forming method of the present invention is applied.
3 to 3, the parts denoted by the same reference numerals as those in FIG. 3 represent the same things.

When attaching the primary fluid side header 9 to the core portion 8, the overlay welding portion 10 between the primary fluid side bar 4 and the secondary fluid side bar 5 which are adjacent to each other via the separate plate 1 is provided. The filler 13 is embedded in the portion where the filler is to be formed, laser welding or electron beam welding is performed on the portion in which the filler 13 is embedded, and the primary fluid side bar 4 and the secondary fluid side which are adjacent to each other via the separate plate 1 A seal weld portion 14 is integrally formed to join the side bar 5 and the filler 13 together.

Laser welding or electron beam welding is TI
Energy convergence density is higher than G welding, etc.
Since the filler 13 is interposed, the seal weld 14
When forming the separate plate 1 and the primary fluid side fin plate 2 or the secondary fluid side fin plate 3
Since there is little heat effect on the brazing filler metal that is brazed to and the brazing filler metal hardly penetrates into the seal welding portion 14, no cracks occur in the seal welding portion 14 itself.

Once the seal weld 14 has been formed, the separate plate 1, the primary fluid side bar 4, the secondary fluid side is formed on the end face of the core portion 8 where the non-corrugated end of the primary fluid side fin plate 2 is located. A build-up weld portion 10 made of weld beads extending in the stacking direction of each member of the side bar 5 is formed by means of TIG welding or the like, and the edge of the primary fluid side header 9 is TIG welded to the build-up weld portion 10. It is fixed by such means.

When forming the above overlay welding portion 10, the brazing material brazing the separate plate 1 to the primary fluid side fin plate 2 or the secondary fluid side fin plate 3 is melted by the influence of TIG welding. However, the seal welding portion 14 prevents the brazing filler metal from penetrating into the overlay welding portion 10, and therefore, no crack is generated in the overlay welding portion 10 due to the penetration of the brazing filler metal.

The method for forming a weld overlay of a laminated structure of the present invention is not limited to the above-described embodiment, but the present invention is applicable to a laminated structure other than the core of a plate fin type heat exchanger. It is needless to say that various modifications can be made without departing from the scope of the present invention.

[0025]

As described above, according to the method for forming a weld overlay of a laminated structure of the present invention, various excellent effects as described below can be obtained.

(1) In any of the methods for forming a weld overlay of a laminated structure according to the present invention, the location where a weld weld between adjacent members is to be formed. Since a seal weld portion is formed by laser welding or electron beam welding in the above, a crack due to the penetration of the brazing material does not occur in the seal weld portion itself, and a build-up weld portion is formed after the seal weld portion is formed. Therefore, the seal welding portion prevents the brazing filler metal from penetrating into the overlay welding portion, and cracks do not occur in the overlay welding portion.

(2) In the overlay welding portion forming method for a laminated structure according to the second aspect of the present invention, the overlay welding portion between each member constituting the laminated structure having the brazing structure should be formed. Since the seal welding portion for joining the adjacent members is formed after the filling member is interposed at the position, the brazing filler metal hardly melts into the sealing welding portion, and the seal welding portion can be formed with high quality. it can.

[Brief description of drawings]

1 is a state in which a method for forming a weld overlay on a laminated structure according to claim 1 of the present invention is applied to an example of a core portion of a plate fin type heat exchanger to form a seal weld portion on the core portion. It is a partial cut perspective view showing.

FIG. 2 is a plan view showing a method for forming a weld overlay on a laminated structure according to claim 1 of the present invention, which is applied to an example of a core portion of a plate fin type heat exchanger to form a weld overlay on the core portion. It is a partial cut perspective view showing a state.

FIG. 3 is a diagram showing a method of forming a weld overlay on a laminated structure according to claim 1 of the present invention, which is applied to an example of a core portion of a plate fin type heat exchanger, to a weld weld formed on the core portion. It is a partial cut perspective view showing the state where the primary fluid side header was fixed by welding.

FIG. 4 is a state in which the overlay welding portion forming method for a laminated structure according to claim 2 of the present invention is applied to an example of a core portion of a plate fin type heat exchanger to form a seal welding portion on the core portion. It is a partial cut perspective view showing.

[FIG. 5] A method of forming a weld overlay on a laminated structure according to claim 2 of the present invention is applied to an example of a core of a plate fin type heat exchanger to form a weld weld on the core. It is a partial cut perspective view showing a state.

FIG. 6 is a diagram illustrating a method of forming a weld overlay on a laminated structure according to a second aspect of the present invention, which is applied to an example of a core portion of a plate fin type heat exchanger to form a weld weld on the core portion. It is a partial cut perspective view showing the state where the primary fluid side header was fixed by welding.

FIG. 7 is a partially cutaway perspective view showing the structure of the core portion of the plate fin type heat exchanger.

FIG. 8 is a partially cutaway perspective view showing a state in which a build-up welded portion is formed on a core portion of a plate fin type heat exchanger by conventional means.

FIG. 9 is a partially cutaway perspective view showing a state in which a primary fluid-side header is fixed by welding to a build-up welded portion formed by conventional means on a core portion of a plate fin type heat exchanger.

[Explanation of symbols]

 1 Separate Plate (Member) 2 Primary Fluid Side Fin Plate (Member) 3 Secondary Fluid Side Fin Plate (Member) 4 Primary Fluid Side Bar (Member) 5 Secondary Fluid Side Bar (Member) 8 Core Part (Layered Structure) Body) 10 Overlay welding part 12,14 Seal welding part 13 Filler (filling member)

Claims (2)

[Claims] 1. A predetermined position of an end face of each member is formed on an end face of a laminated structure in which a plurality of members are laminated and the surfaces of adjacent members that abut each other are fixed by brazing except near a predetermined position of the end face of each member. When forming a weld overlay that extends in the member stacking direction through, after forming a seal weld by laser welding or electron beam welding at a location where a weld weld between adjacent members should be formed, A method of forming a build-up weld portion for a laminated structure, comprising forming a build-up weld portion extending in a member stacking direction. 2. A predetermined position on the end face of each member is formed on the end face of a laminated structure in which a plurality of members are stacked and the surfaces of adjacent members that abut against each other are fixed by brazing except near the predetermined position on the end face of each member. When forming a build-up weld portion that extends through the stack in the member stacking direction, a filler member is interposed at a place where a build-up weld portion between adjacent members is to be formed, and then seal welding by laser welding or electron beam welding is performed. After forming a portion, a build-up weld portion for forming a build-up weld portion extending in the member stacking direction is formed.