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Method for producing axle beam by using preheated flash butt welding

A technology of flash butt welding and pre-flash, applied in welding equipment, resistance welding equipment, metal processing equipment, etc., can solve problems such as unsatisfactory product quality, achieve high fatigue strength, high dimensional accuracy, and improve production efficiency

Inactive Publication Date: 2012-06-20
BPW (MEIZHO) AXLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing welding process of using preheated flash butt welding to produce axle beams cannot fully meet these requirements, resulting in unsatisfactory product quality, and the entire process flow needs to be optimized

Method used

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  • Method for producing axle beam by using preheated flash butt welding
  • Method for producing axle beam by using preheated flash butt welding
  • Method for producing axle beam by using preheated flash butt welding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] 1. Shaft head and shaft tube material——Q345

[0062] 2. Workpiece end face size - 150×150×11 hollow square tube (see Figure 6 ), cross-sectional area 5540mm 2

[0063] 3. Welding process——(1) Pre-flash: The flash margin is about 5mm, and the flash speed is 0.25mm / s; (2) Preheating: There are 46 preheating pulses in total, and in each pulse, the workpiece contact heating time 0.9 seconds, the heating current is 60kA, the pressure applied between the two workpieces is 100kN during heating, the time for the two workpieces to separate for thermal diffusion is 0.6 seconds each time, and the distance between each separation is 1.5mm; (3) Flash: minutes Two stages, the flash speed of the first stage is 0.25mm / s, and the flash margin is 7mm; the flash speed of the second stage is 0.32mm / s, and the flash margin is 3mm; (4) Upsetting: Upsetting force 400kN, current 60kA, loading time 0.6 seconds, the total upsetting allowance is 13mm; (6) Heating and holding pressure: divided...

Embodiment 2

[0066] 1. Shaft head and shaft tube material——Q345.

[0067] 2. Workpiece end face size - 150×150×16 hollow square tube (see Figure 6 ), the cross-sectional area is 7800mm 2 .

[0068] 3. Welding process——(1) Pre-flash: The flash margin is about 4.5mm, and the flash speed is 0.2mm / s; (2) Preheating: There are 44 preheating pulses in total. In each pulse, the workpiece is in contact with the heated The time is 1.1 seconds, the heating current is 64kA, the pressure applied between the two workpieces during heating is 160kN, the time for the two workpieces to separate for thermal diffusion is 0.5 seconds each time, and the distance between each separation is 1.5mm; (3) Flash: It is divided into two stages, the flash speed of the first stage is 0.5mm / s, and the flash margin is 7.5mm; the flash speed of the second stage is 0.8mm / s, and the flash margin is 6.5mm; (4) Upsetting: upsetting force 500kN, current 67kA , the loading time is 1 second, and the total upsetting allowance ...

Embodiment 3

[0071] 1. Shaft head and shaft tube material——Q345.

[0072] 2. The size of the workpiece end face——Φ127×17.5 hollow tube (see see Figure 7 ), cross-sectional area 6020mm 2 .

[0073] 3. Welding process——(1) Pre-flash: The flash flux is about 5mm, and the flash speed is 0.3mm / s; (2) Preheating: There are 46 preheating pulses in total. In each pulse, the contact heating time of the workpiece is 1.0 seconds, the heating current is 60kA, the pressure applied between the two workpieces during heating is 110kN, the time for the two workpieces to separate for thermal diffusion is 0.6 seconds each time, and the distance between each separation is 1.5mm; (3) Flash: divided into two In the first stage, the flash speed is 0.37mm / s, and the flash margin is 7mm; in the second stage, the flash speed is 0.5mm / s, and the flash margin is 5.5mm; (4) Upsetting: Upsetting force 400kN, current 60kA, loading time 0.6 seconds, the total upsetting allowance is 15mm; (6) Heating and holding press...

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Abstract

The invention discloses a method for producing an axle beam by using preheated flash butt welding, which comprises the following steps of: a workpiece clamping step, wherein an axle head and an axle pipe which are used as workpieces are respectively arranged in a shaft beam flash butt welding machine, are clamped by a hydraulic moving clamp and a fixed clamp, and align through an adjustment mechanism; a pre flash step, wherein a power supply is powered on, so that a moving clamp is pushed at a set constant speed, and further, flash can be generated between the workpieces and gradually shortens until the flash margin reaches a preset value; a preheating step, wherein the workpieces are preheated by preset preheated pulses; a flash step, wherein flash is carried out at set speed; an upsetting step, wherein upsetting is carried out immediately after flash; a heating and pressurizing step, wherein the workpieces are applied with preset pressure and are powered on to be heated; and workpiece disassembling step, wherein after welding, the workpieces are disassembled and taken out.

Description

technical field [0001] The present invention relates to flash butt welding technology, in particular to a method for producing axle beams by preheating flash butt welding, especially to an axle beam production process for trailer axles. Background technique [0002] Flash butt welding is a method of always pressing the end faces of two small cross-section workpieces, using low voltage and high current to heat the workpieces to a plastic state, and then quickly applying upsetting pressure (or maintaining the pressure during welding without adding upsetting pressure) to complete longitudinal welding welding method. At present, flash butt welding is often used in the connection of building steel bars and welding of railway rails in China. It is rarely used in the automobile manufacturing industry, and it is unique in the welding of axle heads and axle tubes of trailer axles. [0003] Ordinary flash butt welding machines cannot control the clamping force and upsetting pressure ...

Claims

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Application Information

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IPC IPC(8): B23K11/04
Inventor 童伟健张育俊张雄华邓勇陈刚毅蓝文标温奕行
Owner BPW (MEIZHO) AXLE CO LTD
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