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The workpieces you spot weld are always weak, and here’s why!
Wuxi Xinxing Welding Equipment Factory mainly produces: spot welding machines, butt welding machines, flash butt welding machines, medium frequency spot welding machines, energy storage spot welding machines, nut spot welding machines, polymer diffusion welding machines and other resistance welding equipment! QQ online consultationSitemapContact us
Xinxing. Intelligent resistance welding equipment and solution service provider 33 years of deep experience in the industry help companies solve difficult welding problems and improve welding efficiency!
National service hotline:400-001-050213395100070
Release time:2021.11.20
Summary of information:
Everyone wants a fool-proof automatic welding machine, but depending on conditions, sometimes you have to choose a manual or pneumatic welder. But a novice often finds that no matter how hard he welds, the welding is not firm. What should he do? Here’s why!
1. Problems with welding current
Welding current has the greatest impact on thermal energybig theyYesis directly proportional to the square, somuststrict control。In addition to the total amount of current, the size of the currentIt also has a significant effect on heating.
1) Increasing the electrode contact area or excessively large bump size during projection welding will reduce the electrical size.temperature and welding heat, thereby reducing the strength of the joint.
2) Excessive current density will cause weld metal to spatter, form cavities, weld cracks and reduce mechanical properties.
2. The issue of welding time
Resistance spot weldingIn order to ensure the nugget size and solder joint strength, the welding time and welding current can complement each other within a certain range, and the total heat can be changed by adjusting the current or the welding time. But the heat transfer situation is related to time.
In order to obtain a certain strength of the solder joint:
High current and short time - strong conditions (hard specification) welding can be used;
It is also possible to use low current and long time - weak conditions (soft gauge) welding.
The choice of strong or weak conditions in production depends on the nature and thickness of the metal and the type of welding power source used.
3. Problems with electrode pressure
The electrode pressure has a significant impact on the total resistance R between the two electrodes. As the electrode pressure increases, the interface contact resistance decreases. At this time, although the welding current increases slightly due to the decrease in resistance, it is not enough to affect the decrease in heat generation caused by the decrease in R. Therefore, the strength of the solder joint always decreases with the increase of electrode pressure.
In order to bring the welding heat to the original level and keep the strength of the solder joint unchanged, while increasing the electrode pressure, the welding current or welding time should also be appropriately increased to compensate for the impact of reduced resistance.If the electrode pressure is too small, it will cause metal spatter and also cause the strength of the solder joint to decrease.
4. Problems with electrode shape and materials
The contact area of the electrode determines the current density and the size of the nugget.The resistivity and thermal conductivity of electrode materials are related to the generation and dissipation of heat.The electrode must have appropriate strength and hardness to avoid deformation and loss during repeated pressurization, which will increase the contact area and reduce the joint strength.
5. Problems with the surface condition of weldments
When there are uneven coatings such as oxides, rust or other impurities on the surface of the weldment, the heat generated by each solder joint will be inconsistent due to inconsistent contact resistance, causing fluctuations in welding quality.Therefore, thorough cleaning of the surface to be welded before welding is a necessary condition for obtaining high-quality welded joints.
Wuxi Xinxing Welding Equipment Factory was founded in 1993 and has been a resistance welding machine manufacturer for 28 years. Its products include: foot-operated spot welding machine, pneumatic spot welding machine, medium frequency spot welding machine, energy storage spot welding machine, multi-head spot welding machine, automatic spot welding machine, butt welding machine,Semi-automatic butt welding machine, flash butt welding machine, hydraulic butt welding machine, automatic butt welding machine, row welding machine (multi-head mesh welding machine), multi-strand wire welding machine, cage bone welding machine, special customized special welding machine, etc., more than 300 kinds, with excellent quality and favorable price, welcome to buy!
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Contact Xinxing
- After-sales phone number:400-001-0502
- Pre-sales phone number:199-5222-1801
- Email:cnhjsb@163.com
- Address:Next to Huaming Bridge, 161 kilometers away from National Highway 312, Luoshe Town, Huishan District, Wuxi City, Jiangsu Province
Wuxi Xinxing Welding Equipment FactoryAll rights reserved
Su Public Network Security No. 32020602001105Su ICP No. 11039752
Service hotline 400-001-050213395100070 new manager
Email:cnhjsb@163.com
Factory address: Huishan District, Wuxi City, Jiangsu ProvinceHuamingqiao Industrial Zone, 161 kilometers away from National Highway 312, Luoshe Town, Huishan District, Wuxi City, Jiangsu Province
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Summary of information:
Everyone wants a fool-proof automatic welding machine, but depending on conditions, sometimes you have to choose a manual or pneumatic welder. But a novice often finds that no matter how hard he welds, the welding is not firm. What should he do? Here’s why!
1. Problems with welding current
Welding current has the greatest impact on thermal energybig theyYesis directly proportional to the square, somuststrict control。In addition to the total amount of current, the size of the currentIt also has a significant effect on heating.
1) Increasing the electrode contact area or excessively large bump size during projection welding will reduce the electrical size.temperature and welding heat, thereby reducing the strength of the joint.
2) Excessive current density will cause weld metal to spatter, form cavities, weld cracks and reduce mechanical properties.
2. The issue of welding time
Resistance spot weldingIn order to ensure the nugget size and solder joint strength, the welding time and welding current can complement each other within a certain range, and the total heat can be changed by adjusting the current or the welding time. But the heat transfer situation is related to time.
In order to obtain a certain strength of the solder joint:
High current and short time - strong conditions (hard specification) welding can be used;
It is also possible to use low current and long time - weak conditions (soft gauge) welding.
The choice of strong or weak conditions in production depends on the nature and thickness of the metal and the type of welding power source used.
3. Problems with electrode pressure
The electrode pressure has a significant impact on the total resistance R between the two electrodes. As the electrode pressure increases, the interface contact resistance decreases. At this time, although the welding current increases slightly due to the decrease in resistance, it is not enough to affect the decrease in heat generation caused by the decrease in R. Therefore, the strength of the solder joint always decreases with the increase of electrode pressure.
In order to bring the welding heat to the original level and keep the strength of the solder joint unchanged, while increasing the electrode pressure, the welding current or welding time should also be appropriately increased to compensate for the impact of reduced resistance.If the electrode pressure is too small, it will cause metal spatter and also cause the strength of the solder joint to decrease.
4. Problems with electrode shape and materials
The contact area of the electrode determines the current density and the size of the nugget.The resistivity and thermal conductivity of electrode materials are related to the generation and dissipation of heat.The electrode must have appropriate strength and hardness to avoid deformation and loss during repeated pressurization, which will increase the contact area and reduce the joint strength.
5. Problems with the surface condition of weldments
When there are uneven coatings such as oxides, rust or other impurities on the surface of the weldment, the heat generated by each solder joint will be inconsistent due to inconsistent contact resistance, causing fluctuations in welding quality.Therefore, thorough cleaning of the surface to be welded before welding is a necessary condition for obtaining high-quality welded joints.
Wuxi Xinxing Welding Equipment Factory was founded in 1993 and has been a resistance welding machine manufacturer for 28 years. Its products include: foot-operated spot welding machine, pneumatic spot welding machine, medium frequency spot welding machine, energy storage spot welding machine, multi-head spot welding machine, automatic spot welding machine, butt welding machine,Semi-automatic butt welding machine, flash butt welding machine, hydraulic butt welding machine, automatic butt welding machine, row welding machine (multi-head mesh welding machine), multi-strand wire welding machine, cage bone welding machine, special customized special welding machine, etc., more than 300 kinds, with excellent quality and favorable price, welcome to buy!
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