Induction welding method for aluminum water-cooling base plate and stainless joint

A technology of water-cooled base plate and induction welding, which is applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc. It can solve the problems of locomotives not running normally, difficult to control welding temperature, and burning out electrical components, etc. Intelligent protection, automatic welding control and safe operation

Active Publication Date: 2010-02-10
CRRC DALIAN INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The above-mentioned welding processing method has the following disadvantages: the gas welding seal is manually operated, and because the melting point temperature of the two materials is different, it is extremely difficult to control the welding temperature. Fully caulked and sealed at joined chamfers
When the cooling system is working, the high-speed operation of the water pump promotes the high-speed circulation of the cooling medium in the system pipeline. If there is a small leak at the connection between the water inlet and outlet of the water-cooling substrate and the stainless steel joint, it will burn out the electrical components or even form a short circuit, causing the locomotive to malfunction. run, the consequences are disastrous

Method used

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  • Induction welding method for aluminum water-cooling base plate and stainless joint
  • Induction welding method for aluminum water-cooling base plate and stainless joint
  • Induction welding method for aluminum water-cooling base plate and stainless joint

Examples

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example 1

[0048] Soak the stainless steel joint and the end face of the water-cooled substrate in 8% sodium hydroxide solution at a temperature of 85°C for 20 seconds, take out the above-mentioned workpiece, and then soak it in 10% sulfuric acid solution at room temperature for 5 seconds, rinse with water The surface of the workpiece is dried, and then the stainless steel joint is installed on the end face of the water-cooled substrate. Take a zinc-aluminum alloy with a diameter of 2.5mm and a melting point of 420-480°C with a flux-cored welding wire. The calibration composition of the welding wire is as follows: Pb 0.005% MAX, Fe 0.005% MAX, Cu 0.005% MAX, Cd 0.005% MAX, Al 2.4% MAX, Zn balance. The above-mentioned welding wire is bent into a circle and placed at the root of the stainless steel joint exposing the end surface of the water-cooling substrate and the chamfer of the screw hole on the end surface of the water-cooling substrate, and the welding wire bent into a circle is tigh...

example 2

[0058] Soak the stainless steel joint and the end face of the water-cooled substrate in a 10% sodium hydroxide solution at a temperature of 75°C for 15 seconds, take out the above-mentioned workpiece, and then soak it in a 9% sulfuric acid solution at room temperature for 6 seconds, and rinse the cleaned parts with water. The surface of the workpiece is dried, and then the stainless steel joint is installed on the end face of the water-cooled substrate. Take a zinc-aluminum alloy with a diameter of 3.5mm and a melting point of 420-480°C with flux cored welding wire. The calibration composition of the welding wire is as follows: Pb 0.005% MAX, Fe 0.005% MAX, Cu 0.005% MAX, Cd 0.005% MAX, Al 2.4% MAX, Zn balance. The above-mentioned welding wire is bent into a circle and placed at the root of the stainless steel joint exposing the end surface of the water-cooling substrate and the chamfer of the screw hole on the end surface of the water-cooling substrate, and the welding wire b...

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Abstract

The invention relates to an induction welding method for an aluminum water-cooling base plate and a stainless joint, which mainly comprises the following steps: processing the stainless joint and thewater-cooling base plate by sodium hydroxide and sulfuric acid solution and drying; bending a zinc-aluminum alloy flux-cored welding wire with a melting point of 420-480 DEG C into a circle and placing the zinc-aluminum alloy flux-cored welding wire to the root part of the stainless joint exposing out of the end surface of the water-cooling base plate and the chamfering position of a screw hole ofthe end surface of the water-cooling base plate; connecting an induction coil of the water-cooling base plate with one induction heating power supply and placing the water-cooling base plate into theinduction coil; connecting an induction coil of the stainless joint with the other high frequency induction heating power supply and placing the stainless joint into the induction coil. The temperature in the welding position of the water-cooling base plate rises to 450-480 DEG C and the temperature in the welding position of the stainless joint rises to 500-550 DEG C during welding. The invention more ideally solves the problem of welding two different material components of aluminum and stainless steel; welded brazing filler metal has full and even appearance and completely fills a seam andcan lead the welding position to be sealed permanently; and the stable working state of an IGBT power module is ensured.

Description

technical field [0001] The invention relates to a processing method for an IGBT power module constant temperature cooling device of an electric locomotive and an EMU. Background technique [0002] At present, the constant temperature cooling devices of the IGBT power modules of electric locomotives and EMUs generally use aluminum water-cooled substrates, that is, dozens of water-cooled substrates are installed in the high-voltage electrical cabinet of an electric locomotive or EMU, and each water-cooled substrate is installed. more than one IGBT power module. The above-mentioned water-cooled substrate is mainly composed of a water-cooled tank plate, a water-cooled cover plate, soldering tabs, and stainless steel joints. The processing method of the aluminum water-cooled base plate mainly includes: welding the rough machined water-cooled tank plate and water-cooled cover plate with welding pieces through vacuum brazing, and then drilling two Φ10.8 holes on the end face and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/002B23K1/20B23K35/28
Inventor 宋玉鹏刘俊杰
Owner CRRC DALIAN INST CO LTD
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