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Spot welding (also known as resistance spot welding) is a resistance welding process. This welding process is used primarily for welding two or more metal sheets together by applying pressure and heat from an electric current to the weld area.
- Resistive spot welding (RSW) is a process in which contacting metal surfaces are joined by the heat obtained from resistance to electric current.
- It is used to weld/fuse two pieces of flat materials together without the need to weld, rivet, or screw parts together.
- The process uses two shaped copper alloy electrodes to concentrate welding current into a small “spot”, simultaneously clamping the sheets together. Forcing a large current through the spot will melt the metal and form the weld.
- the Spot welding is one of the fastest and cleanest welding methods.
- It is an Easy and straight forward process, unlike some other more complex welding techniques.
- You can contact us at Info@taimco.ca for your project, I am sure we can help.
At TAIMCO you are:
- Getting Strength and durability improvements: Additionally, projects with custom metal fabrication have more strength and durability. Parts created especially for a project are more durable than generic ones. The lifespan of the finished product is frequently increased because of this technique.
- Saving time and money: Custom metal fabrication at Taimco can save time, money, and effort in a variety of ways for any project. It reduces the number of errors that frequently need to be corrected later, eliminates unplanned costs related to flawed measures, and can be tailored to meet specific demands and requirements.
- Getting Creative: The innovative and imaginative process of custom metal fabrication results in a distinctive finished product. There aren’t many limitations on what may be done with this approach; thus, creativity is virtually limitless.
SKU: N/A Categories: Industrial Metal Fabrication, Spot Welding Tags: battery spot welder, cleanest welding method, Industrial Metal Fabrication, resistance spot welding, resistance welding, Resistive spot welding, sheets, spot weld cutter, spot welder, Spot Welding, spot welding machine, Taimco Spot welding, welding, welding techniques
- Where is the Spot Welding been Used? Spot welding has applications in a number of industries, including automotive, aerospace, rail, white goods, metal furniture, electronics, medical building and construction, Given the ease with which spot welding can be automated when combined with robots and manipulation systems, it is the most common joining process in high-volume manufacturing lines and has in particular been the main joining process in the construction of steel cars for over 100 years.
There are two types of non-consumable electrodes that are used in spot welding, Conductive electrodes. Used to weld resistive materials, such as stainless steel and nickel. …Resistive electrodes. These electrodes are generally used for conductive metals like copper and gold.
The Welding Control Is the Heart of the System, every time you make a spot weld, its quality and consistency depend on the resistance welding control.
we do always look for the ultimate spot-welding operation, considering up-to-date welding machines to provide the best work quality.
What is the spot welding?
- A form of resistance welding, spot welding is one of the oldest welding processes whereby two or more sheets of metal are welded together without the use of any filler material.
- The process involves applying pressure and heat to the weld area using shaped alloy copper electrodes which convey an electrical current through the weld pieces. The material melts, fusing the parts together at which point the current is turned off, pressure from the electrodes is maintained and the molten “nugget” solidifies to form the joint.
- The welding heat is generated by the electric current, which is transferred to the workpiece through copper alloy electrodes. Copper is used for the electrodes as it has a high thermal conductivity and low electrical resistance compared to most other metals, ensuring that the heat is generated preferentially in the work pieces rather than the electrodes the amount of heat depends on the thermal conductivity and electrical resistance of the metal as well as the amount of time the current is applied.
Materials are Appropriate for Spot Welding,
- Due to its lower thermal conductivity and higher electrical resistance, steel is comparatively easy to spot weld, with low-carbon steel being most suited to spot welding. However, high carbon content steels (Carbon equivalence > 0.4wt%) are prone to poor fracture toughness or cracking in the welds as they tend to form hard and brittle microstructures.
- Galvanized steel (zinc coated) requires slightly higher welding currents to weld than uncoated steel. Also, with zinc alloys, the copper electrodes rapidly degrade the surface and lead to a loss of weld quality. When spot welding zinc coated steels, electrodes must either be frequently exchanged or the electrode tip surface should be ‘dressed’, where a cutter removes contaminated material to expose a clean copper surface and reshapes the electrode.
- Other materials commonly spot welded include stainless steels (in particular austenitic and ferritic grades), nickel alloys and titanium.
- Although aluminum has a thermal conductivity and electrical resistance close to that of copper, the melting point for aluminum is lower, which means welding is possible. However, due to its low resistance, very high levels of the current need to be used when welding aluminum (in the order of two to three times higher than for steel of equivalent thickness).
- In addition, aluminum degrades the surface of copper electrodes within a very small number of welds, meaning that stable high-quality welding is very hard to achieve. For this reason, only specialist applications of aluminum spot welding are currently found in the industry. Various new technology developments are emerging to help enable stable high-quality spot welding in aluminum.
- Copper and its alloys can also be joined by resistance spot welding, although spot welding copper cannot be easily achieved with conventional copper alloy spot welding electrodes, as heat generation in the electrodes and workpiece are very similar.
- The solution to welding copper is to use an electrode made of an alloy with high electrical resistance and a melting temperature far in excess of the melting point of copper (much greater than 1080°C). Electrode materials typically used for spot welding copper include molybdenum and tungsten.
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