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The functions of flash, upsetting and preheating in flash butt welding machines
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The role of flash, upsetting and preheating in flash butt welding machine-Xinxing Welding
Release time:2022.01.23
Summary of information:
When the flash butt welding machine butts the workpieces, it goes through the preheating stage, enters the flash stage and then enters the upsetting stage. A series of actions complete the welding. What is their basic function?
■What is flash?
flash pairDuring welding, sparks of shiny metal droplets spatter from the butt joints of the welded parts.
What is the essence of flash formation?
When the power is turned on and the end faces of the two weldments are in slight contact, many small contacts with high resistance will be formed between the butt joints. Under the heating of a large current density, they will melt instantly to form a liquid beam connecting the two end faces. Under the combined action of various forces and strong heating, a huge pressure difference and temperature difference are formed between the inside of the lintel and its surface, causing the lintel to explode, causing the liquid metal to explode.
The droplets are ejected from the gap between the two openings at a speed exceeding 60m/s, forming a spark jet - a flash. In short, the essence of flash formation is the continuous formation and explosion process of liquid lintels, and a large amount of heat is released in the process.
1.Flash butt welding machineThe role of flash
1. Heating the weldment
2. Burn off the dirt and unevenness on the end face of the weldment.
3.Self-protection
4. Form a liquid layer
2. The function of upsetting
1. Close the gap at the joint and squeeze out the fire hole left by the blasting of the lintel.
2. Completely remove the liquid metal layer on the end face so that no casting structure remains in the weld.
3. Eliminate overheated metal and oxidized inclusions, resulting in a close fit of clean metal.
4. Enable appropriate plastic deformation of the counterpart and adjacent areas to promote the recrystallization process of the weld.
3. The role of flash butt welding machine preheating
1. Reduce the power required, and can butt weld large-section weldments on a smaller-capacity welding machine.
2. The wider heating area makes plastic deformation more likely to occur during upsetting and can reduce the cooling rate after welding, which is beneficial to butt welding of hardenable metal materials.
3. Shortening the flash heating time and reducing the amount of flash can not only save metal, but also reduce internal burrs on the pipe.
Wuxi Xinxing Welding Equipment Factory was founded in 1993 and is a resistance welding machine manufacturer with 29 years of innovation and development. The products it produces and sells include: spot welding machines, iron sheet spot welding machines, copper sheet spot welding machines, aluminum foil spot welding machines, stainless steel spot welding machines, aluminum plate spot welding machines, stencil spot welding machines,Microelectronic spot welding machine, butt welding machine, copper rod butt welding machine, iron wire butt welding machine, steel bar butt welding machine, aluminum rod butt welding machine, titanium wire butt welding machine, alloy wire butt welding machine, steel ring butt welding machine, wheel hub butt welding machine, copper aluminum butt welding machine, copper aluminum tube butt welding machine, etc., whether semi-automatic or automatic, we have them all, excellent quality, favorable price, many cases, welcome to consult and purchase!
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The role of flash, upsetting and preheating in flash butt welding machine-Xinxing Welding
Summary of information:
When the flash butt welding machine butts the workpieces, it goes through the preheating stage, enters the flash stage and then enters the upsetting stage. A series of actions complete the welding. What is their basic function?
■What is flash?
flash pairDuring welding, sparks of shiny metal droplets spatter from the butt joints of the welded parts.
What is the essence of flash formation?
When the power is turned on and the end faces of the two weldments are in slight contact, many small contacts with high resistance will be formed between the butt joints. Under the heating of a large current density, they will melt instantly to form a liquid beam connecting the two end faces. Under the combined action of various forces and strong heating, a huge pressure difference and temperature difference are formed between the inside of the lintel and its surface, causing the lintel to explode, causing the liquid metal to explode.
The droplets are ejected from the gap between the two openings at a speed exceeding 60m/s, forming a spark jet - a flash. In short, the essence of flash formation is the continuous formation and explosion process of liquid lintels, and a large amount of heat is released in the process.
1.Flash butt welding machineThe role of flash
1. Heating the weldment
2. Burn off the dirt and unevenness on the end face of the weldment.
3.Self-protection
4. Form a liquid layer
2. The function of upsetting
1. Close the gap at the joint and squeeze out the fire hole left by the blasting of the lintel.
2. Completely remove the liquid metal layer on the end face so that no casting structure remains in the weld.
3. Eliminate overheated metal and oxidized inclusions, resulting in a close fit of clean metal.
4. Enable appropriate plastic deformation of the counterpart and adjacent areas to promote the recrystallization process of the weld.
3. The role of flash butt welding machine preheating
1. Reduce the power required, and can butt weld large-section weldments on a smaller-capacity welding machine.
2. The wider heating area makes plastic deformation more likely to occur during upsetting and can reduce the cooling rate after welding, which is beneficial to butt welding of hardenable metal materials.
3. Shortening the flash heating time and reducing the amount of flash can not only save metal, but also reduce internal burrs on the pipe.
Wuxi Xinxing Welding Equipment Factory was founded in 1993 and is a resistance welding machine manufacturer with 29 years of innovation and development. The products it produces and sells include: spot welding machines, iron sheet spot welding machines, copper sheet spot welding machines, aluminum foil spot welding machines, stainless steel spot welding machines, aluminum plate spot welding machines, stencil spot welding machines,Microelectronic spot welding machine, butt welding machine, copper rod butt welding machine, iron wire butt welding machine, steel bar butt welding machine, aluminum rod butt welding machine, titanium wire butt welding machine, alloy wire butt welding machine, steel ring butt welding machine, wheel hub butt welding machine, copper aluminum butt welding machine, copper aluminum tube butt welding machine, etc., whether semi-automatic or automatic, we have them all, excellent quality, favorable price, many cases, welcome to consult and purchase!
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