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Spot Welding is a process where two pieces of overlapping metal are welded by applying an electric current through two contact points. The interface of the parts creates current resistance which produces heat. The two metals form a "button" type weld when pressure is applied. The welds will be of the approximate size of the contact points and the filler metal consists of the base materials only (additional material is not generally added). The equipment used for spot welding in smaller operations would consist of a set of "tongs" that apply current and pressure to the parts being welded. This process can be accomplished using a portable unit or an automated process such as with automobile manufacturing.
Workpieces are held together under weight applied by anodes. Normally the sheets are in the 0.5 to 3 mm (0.020 to 0.118 in) thickness extend. The procedure utilizes two molded copper combination anodes to gather welding current into a little "spot" and to at the same time cinch the sheets together. Driving a vast current through the spot will dissolve the metal and shape the weld. The appealing element of spot welding is that a considerable measure of vitality can be conveyed to the spot in a brief span (roughly 10-100 milliseconds).[2] That allows the welding to happen without over the top warming of the rest of the sheet.
The measure of warmth (vitality) conveyed to the spot is controlled by the resistance between the terminals and the size and length of the current.[3] The measure of vitality is coordinated the sheet's material properties, its thickness, and kind of cathodes. Applying too little vitality won't dissolve the metal or will make a poor weld. Applying a lot of vitality will soften an excessive amount of metal, launch liquid material, and make a gap as opposed to a weld.[4] Another element of spot welding is that the vitality conveyed to the spot can be controlled to deliver solid welds.
Projection welding is an alteration of spot welding. In this procedure, the weld is limited by a method for raised segments, or projections, on either of the workpieces to be joined. Warmth is amassed at the projections, which allows the welding of heavier segments or the nearer dividing of welds. The projections can likewise serve as a method for situating the workpieces. Projection welding is regularly used to weld studs, nuts, and other screw machine parts to the metal plate. It is additionally oftentimes used to join crossed wires and bars. This is another high-generation prepare, and numerous projection welds can be masterminded by reasonable outlining and jigging
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How many welding and joining processes are available commercially?
There are numerous commercially available welding and joining processes, with the most common ones including arc welding, MIG (metal inert gas) welding, TIG (tungsten inert gas) welding, resistance welding, and laser welding. Additionally, processes like spot welding, electron beam welding, and friction welding are also widely used in various industries. The choice of process often depends on factors such as the materials being joined, the desired strength of the joint, and production efficiency. Overall, the diversity of welding and joining methods enables tailored solutions for specific applications across different sectors.
What are applications of explosion welding over conventional welding?
The biggest application of explosion welding is the cladding of flat plate.
What is horizontal welding position?
Look at a wall. Imagine welding on that wall from left to right or right to left. That is horizontal welding.
Who is responsible for standardizing the welding symbol?
Any standards that are welding related in the United States are designated by the American Welding Society (AWS).
What the meaning of MPI in welding?
The meaning of MPI in welding is Magnetic Particle Inspection.
What type of welding machine use in spot welding or resistance welding?
Mainly In spot welding & resistance welding two type welding machines are used :- 1. Air Cooled & 2. water Cooled.
When was the spot welder invented?
Spot welding is a form of resistance welding invented by Elihu Thompson in the late 1800s.
What is the purpose for welding with direct current?
spot welding is one reason
Why spot welding robot not used in arc welding?
A spot welding robot has generally 5 axis opposed to an arc welding robot that needs 6 axis. The controls and communication channels with the welding power supplies are configured differently as well.
What is land in spot welding process?
land ?
Can a threaded joint be welded?
yes ,we can weld this. welding is the process of joining two materials .we can join this by spot welding or by arc welding.
Can you use Stick Welding machine for Spot Welding if yes how?
They sell a spot welding gun that plugs into a DC arc welder. If you have an AC225 or some other AC-only machine, this won't work. In general, tho, spot welders have their own power supplies so you don't need to reconfigure your stick welding machine for this.
What is the schematic diagram of spot weld D-25?
spot welding electrical diagram
Difference between ERW and SAW welding?
SAW welding is a type of arc welding while ERW welding is spot or seam welding. SAW stand for submerged arc welding while ERW stands for electric resistance welding.
What is difference between seam welding and spot welding?
The only difference between the two is that projection welding requires preparation of the joint members in the way of adding a preformed dimple or projection. Spot welding is used without such preparation to the joint members. it's just heat and pressure.
Where can you find information on spot welding?
Information is available on spot welding for one to read online at the Onspotwelding's official website. Other resources include the Slideshare's website and Millerwelds.
Why spot welding known as resistance welding?
Spot welding is known as resistance welding because the the two pieces of metal melt together at the point of highest resistance to current flow, basically when the electricity flows through the pieces it heats up at the point of highest resistance that is where where the metal pieces touch and in a direct line from the two contact tips on the spot welder. Simple!
