Automatic argon arc welding method for aluminum alloy plate-fin radiator

Abstract

The invention discloses an automatic argon arc welding method for an aluminum alloy plate-fin radiator, which comprises the following steps that: aiming at a brazed aluminum alloy plate-fin radiator core body, laser welding is firstly adopted to carry out edge sealing welding on a side plate and a sealing strip, and the position of a laser welding seam corresponds to the position of a brazed seam of the side plate and the sealing strip; and then the gas collecting hood is welded on the side plate through automatic argon arc welding. According to the method, edge sealing welding of the side plates and the sealing strips is achieved through laser welding, the weld penetration is controlled by controlling welding parameters of laser welding, and the requirement of a follow-up automatic argon arc welding gas collecting hood is met; the problem that when automatic argon arc welding is carried out on the aluminum alloy plate-fin radiator core and the gas collecting hood, brazing seam cavity channeling and leakage are likely to happen is solved, and the welding efficiency and welding quality of the aluminum alloy plate-fin radiator are improved.

Description

Technical Field

[0001] This invention belongs to the field of automatic aluminum alloy welding technology, and specifically relates to an automatic argon arc welding method for aluminum alloy plate-fin radiators. Background Technology

[0002] With the development of intelligent manufacturing in industry, the application of automated welding technology in enterprises is gradually increasing. For aluminum alloy plate-fin radiators, the large market demand is also driving this type of product towards automated welding.

[0003] Currently, the sealing strips and side plates of aluminum alloy plate-fin radiators are sealed using manual TIG welding. However, the penetration depth of manual TIG welding is relatively shallow (see...). Figure 1 Increasing the welding current can lead to severe deformation of the core weld, or even cracking of the brazed seam. When the core with manually sealed edges is then subjected to subsequent automatic TIG welding, the automatic TIG welding requires full penetration at the side plate position. This can cause the original manually sealed TIG weld to remelt and crack. Coupled with the problems of welding stress and unstable brazing quality, this can lead to the risk of cavity leakage in the original core brazed seam.

[0004] Therefore, manual TIG welding for edge sealing is the key obstacle to achieving automated TIG welding of aluminum alloy plate-fin radiators. Summary of the Invention

[0005] The present invention aims to provide an automatic argon arc welding method for aluminum alloy plate-fin radiators, avoiding the leakage problem caused by the brazing seam when the core and gas collection shroud of aluminum alloy plate-fin radiators are automatically welded, thus successfully realizing the automatic argon arc welding of aluminum alloy plate-fin radiators and improving welding efficiency and welding quality.

[0006] To solve the above problems, the present invention adopts the following technical solution: An automatic argon arc welding method for aluminum alloy plate-fin radiators includes: For the aluminum alloy plate-fin radiator core that has been brazed, the side plate and sealing strip are first sealed by laser welding. The laser welding seam position corresponds to the brazed seam position of the side plate and sealing strip. Then, the gas collection cover is welded to the side plate by automatic argon arc welding.

[0007] Alternatively, when the laser welding is used to seal the side plates and the sealing strip, the welding parameters of the laser welding are adjusted to control the penetration depth of the laser weld to meet the requirements of the subsequent automatic argon arc welding of the gas collection hood.

[0008] Alternatively, the welding parameters of the laser welding include laser power, duty cycle, pulse frequency, scanning waveform, scanning frequency, scanning range, scanning speed, and welding speed.

[0009] Alternatively, when the laser welding is used to seal the side plates and the sealing strip, a coaxial side-blown protective gas method is used for welding.

[0010] Alternatively, when welding the gas collection hood to the side plate by automatic argon arc welding, bevels are first machined on the side plate and the gas collection hood.

[0011] Alternatively, after beveling the side plate and the gas collection shroud, the aluminum alloy plate-fin radiator core and the gas collection shroud are placed together on a tack welding fixture for assembly, and then tack welding is performed.

[0012] Compared with existing technologies, this invention uses laser welding for core sealing, resulting in a deeper weld penetration than manual TIG welding. This weld penetration is adjustable and controllable, minimizing core deformation and preventing brazing defects. Laser welding is several times faster than manual TIG welding, and the weld seam exhibits fewer internal porosity defects. Therefore, laser welding improves weld quality and efficiency, effectively avoiding the leakage problem that occurs during automatic TIG welding of the aluminum alloy plate-fin radiator core and gas collector. Ultimately, this achieves automatic TIG welding of the aluminum alloy plate-fin radiator core and gas collector, improving both welding efficiency and quality. Attached Figure Description

[0013] Figure 1 This is a diagram of the argon arc welding sealing of the sealing strip and side plate of an aluminum alloy plate-fin radiator; Figure 2 This is a schematic diagram of the core structure of an aluminum alloy plate-fin radiator; Figure 3 This is a schematic diagram of laser welding and sealing the core of an aluminum alloy plate-fin radiator. Figure 4 This is a schematic diagram of the welding joint between the core of an aluminum alloy plate-fin radiator and the gas collection shroud. Figure 5 This is a schematic diagram of an automated argon arc weld and a laser-sealed edge weld; In the diagram: 1-side plate, 2-brazed seam, 3-seal, 4-laser weld, 5-laser beam, 6-gas collection hood, 7-bevel surface, 8-automatic argon arc weld. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0015] like Figures 2-4 As shown, this invention proposes an automatic argon arc welding method for aluminum alloy plate-fin radiators, comprising the following steps: Step 1: Clean the welding area between the side plate 1 and the seal 3 with a wire brush, specifically the area near the brazed joint 2 between the side plate 1 and the seal 3; Step 2: Debug the laser welding equipment to ensure it is working properly, align the laser focus, and program the laser welding process for the area to be welded. Step 3: Adjust the laser welding parameters. In this embodiment, the laser welding parameters for the aluminum alloy plate-fin heat sink include: laser power of 700W; duty cycle of 100%; pulse frequency of 2000Hz; scanning waveform of "◎" (i.e., the laser welding uses a ring spot); scanning frequency of 50Hz; scanning range of 2.5mm; scanning speed of 200mm / s; welding speed of 15mm / s; coaxial protective argon flow rate of 15mL / min; and side-blown protective argon flow rate of 30mL / min.

[0016] Step 4: Turn on the laser beam 5 and perform laser welding. After the effective weld penetration is formed, check the surface of the laser weld 4 for defects such as pores, cracks, and weld beads. Step 5: Machining the side plate 1 and adding a bevel, with the bevel surface 7 having an angle of 2.5mm × 45°; Step 6: Assemble the aluminum alloy plate-fin radiator core and the gas collection cover 6 on the positioning welding fixture, and then perform positioning welding at the four corners. Step 7: Perform automated TIG welding. Figure 5 The image shows an automated TIG weld seam 8.

[0017] In this invention, the weld penetration depth of laser welding is greater than that of argon arc welding. Laser welding controls the weld penetration depth by means of power, welding speed, scanning frequency and scanning waveform, while argon arc welding controls the weld penetration depth by means of welding current, welding speed, pulse frequency, duty cycle, arc voltage height and helium-argon mixing ratio. Ultimately, this ensures that aluminum alloy plate-fin heat sinks can be successfully automated for argon arc welding after laser welding.

[0018] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made under the concept of the present invention using the description and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An automatic argon arc welding method for aluminum alloy plate-fin radiators, characterized in that, include: For the aluminum alloy plate-fin radiator core that has been brazed, the side plate (1) and the sealing strip (3) are first sealed by laser welding. The laser welding weld (4) is located at the position of the brazed weld (2) of the side plate (1) and the sealing strip (3). Then, the gas collection cover (6) is welded to the side plate (1) by automatic argon arc welding.

2. The automatic argon arc welding method for an aluminum alloy plate-fin radiator according to claim 1, characterized in that: When the laser welding is used to seal the side plate (1) and the sealing strip (3), the welding parameters of the laser welding are adjusted to control the penetration depth of the laser welding seam (4) to meet the requirements of the subsequent automatic argon arc welding gas collection hood (6).

3. The automatic argon arc welding method for an aluminum alloy plate-fin radiator according to claim 2, characterized in that: The welding parameters for laser welding include laser power, duty cycle, pulse frequency, scanning waveform, scanning frequency, scanning range, scanning speed, and welding speed.

4. The automatic argon arc welding method for an aluminum alloy plate-fin radiator according to claim 1, characterized in that: When the laser welding is used to seal the side plate (1) and the sealing strip (3), the welding is carried out by coaxial side blowing protective gas.

5. The automatic argon arc welding method for an aluminum alloy plate-fin radiator according to claim 1, characterized in that: When welding the gas collecting hood (6) to the side plate (1) by automatic argon arc welding, bevels are first processed on the side plate (1) and the gas collecting hood (6).

6. The automatic argon arc welding method for an aluminum alloy plate-fin radiator according to claim 5, characterized in that: After beveling the side plate (1) and the gas collection cover (6), the aluminum alloy plate-fin radiator core and the gas collection cover (6) are placed together on the positioning welding fixture for assembly, and then positioning welding is performed.

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