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What is the flash allowance and upsetting allowance when the flash butt welding machine is used?
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What is the flash allowance and upsetting allowance when the flash butt welding machine is used?
Release time:2022.01.20
Summary of information:
Whether it is manual butt welding or flash butt welding, there is a burning stage and an upsetting stage, so naturally there are flash (burning) retention values and upsetting retention values. How to set them? Let’s take a look with the editor of Xinxing Welding.
1. Flash retention amount
Flash butt welding machineThe flash allowance in is the burning allowance: it refers to the length of the workpiece consumed due to the "flash" of metal during the flash process.
When selecting the flash allowance, it should be such that there is a molten metal layer on the entire end face of the workpiece at the end of the flash, and the plastic deformation temperature is reached at a certain depth. If the allowance is too short, the above requirements cannot be met and the welding quality will be affected. Leaving it too long will waste metal materials and reduce productivity. When selecting the length, you should also consider whether there is preheating, because the length of preheated flash butt welding can be 30% to 50% smaller than that of continuous flash butt welding. For example: for steel bars, the allowance for continuous flashing is equal to the part severely crushed by the cutting machine blade when the steel bar is cut off, plus 8mm. During preheating flash welding, the allowance should not be less than 10mm.
2. Upsetting allowance.
Pre-forging allowance: refers to the length of the workpiece consumed due to metal extrusion from the joint after the workpiece is upturned and pressed at the end of the flashing process.
It affects the removal of liquid metal and the size of plastic deformation. If the length is too short, liquid metal will remain in the joint, which can easily form defects such as looseness, shrinkage holes, and cracks; if the length is too long, the impact toughness of the joint will be reduced due to severe bending of the crystal grains. The length is selected according to the cross-sectional area of the workpiece, and increases as the cross-sectional area increases.
During upsetting, in order to prevent the interface from oxidation, the current is not cut off immediately before the end interface is closed, so the upsetting allowance should include two parts - the upsetting allowance with electric current and the upsetting allowance without current. The former is 0.5~1 times that of the latter. For example, for steel bars, the upsetting allowance should be 4-10mm, which increases with the increase in diameter and grade of steel bars (the electric upsetting allowance accounts for about 1/3).
Wuxi Xinxing Welding Equipment Factory was founded in 1993, 29Annual resistance welding machine manufacturer, its products include: spot welding machine, AC spot welding machine, DC spot welding machine, secondary rectifier spot welding machine, medium frequency spot welding machine, automatic spot welding machine, energy storage spot welding machine, butt welding machine, steel bar butt welding machine, steel pipe automatic butt welding machine, flange flash butt welding machine, aluminum alloy hydraulic butt welding machine,Fully automatic butt welding machine, more than 300 types of row welding machines (multi-head mesh welding machines), multi-strand wire welding machines, cage bone welding machines, special customized butt spot welding machines, etc., with excellent quality, favorable prices, and many videos, welcome to consult and purchase!
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What is the flash allowance and upsetting allowance when the flash butt welding machine is used?
Summary of information:
Whether it is manual butt welding or flash butt welding, there is a burning stage and an upsetting stage, so naturally there are flash (burning) retention values and upsetting retention values. How to set them? Let’s take a look with the editor of Xinxing Welding.
1. Flash retention amount
Flash butt welding machineThe flash allowance in is the burning allowance: it refers to the length of the workpiece consumed due to the "flash" of metal during the flash process.
When selecting the flash allowance, it should be such that there is a molten metal layer on the entire end face of the workpiece at the end of the flash, and the plastic deformation temperature is reached at a certain depth. If the allowance is too short, the above requirements cannot be met and the welding quality will be affected. Leaving it too long will waste metal materials and reduce productivity. When selecting the length, you should also consider whether there is preheating, because the length of preheated flash butt welding can be 30% to 50% smaller than that of continuous flash butt welding. For example: for steel bars, the allowance for continuous flashing is equal to the part severely crushed by the cutting machine blade when the steel bar is cut off, plus 8mm. During preheating flash welding, the allowance should not be less than 10mm.
2. Upsetting allowance.
Pre-forging allowance: refers to the length of the workpiece consumed due to metal extrusion from the joint after the workpiece is upturned and pressed at the end of the flashing process.
It affects the removal of liquid metal and the size of plastic deformation. If the length is too short, liquid metal will remain in the joint, which can easily form defects such as looseness, shrinkage holes, and cracks; if the length is too long, the impact toughness of the joint will be reduced due to severe bending of the crystal grains. The length is selected according to the cross-sectional area of the workpiece, and increases as the cross-sectional area increases.
During upsetting, in order to prevent the interface from oxidation, the current is not cut off immediately before the end interface is closed, so the upsetting allowance should include two parts - the upsetting allowance with electric current and the upsetting allowance without current. The former is 0.5~1 times that of the latter. For example, for steel bars, the upsetting allowance should be 4-10mm, which increases with the increase in diameter and grade of steel bars (the electric upsetting allowance accounts for about 1/3).
Wuxi Xinxing Welding Equipment Factory was founded in 1993, 29Annual resistance welding machine manufacturer, its products include: spot welding machine, AC spot welding machine, DC spot welding machine, secondary rectifier spot welding machine, medium frequency spot welding machine, automatic spot welding machine, energy storage spot welding machine, butt welding machine, steel bar butt welding machine, steel pipe automatic butt welding machine, flange flash butt welding machine, aluminum alloy hydraulic butt welding machine,Fully automatic butt welding machine, more than 300 types of row welding machines (multi-head mesh welding machines), multi-strand wire welding machines, cage bone welding machines, special customized butt spot welding machines, etc., with excellent quality, favorable prices, and many videos, welcome to consult and purchase!
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