Seam Welding Pdf
Higher current is required as compared to spot welding. The type of welding in which the two contacting surfaces are joined from the resistance obtained from the electric current is known as Resistance Spot Welding. This welding uses wheel electrodes while spot welding uses point electrode. Intermittent and continuous.
No pollutions like fumes of gases because filler material is not utilized. Intermittent Motion Seam Welding. Like spot welding, seam welding relies on two electrodes, usually made from copper, to apply pressure and current. This allows the electrodes to stay in constant contact with the material to make long continuous welds. Continuous, leak-tight joint is formed as a result of this welding.
Seam welding has been used to manufacture steel beverage cans but is no longer used for this as modern beverage cans are seamless aluminum. When high strength in shear is needed, spot welding is used in preference to more costly mechanical fastening, such as riveting. Resistance seam welding is a process that produces a weld at the faying surfaces of two similar metals.
Heat-affected zone Photokeratitis Residual stress Weldability. It is also used in the fabrication of heat exchangers.
Seam welding core principles are similar to that of the Resistance spot welding. The seam may be a butt joint or an overlap joint and is usually an automated process. Seam welding produces an extremely durable weld because the joint is forged due to the heat and pressure applied.
What is Seam Welding
The electrodes are often disc shaped and rotate as the material passes between them. In mash welding a small sheets overlap occurs, that is one to two times the thickness of the sheets. When the current is stopped the copper tips cool the spot weld, causing the metal to solidify under pressure. Workpieces need to be overlapped to make sure that no overflow of melted metal occurs. The mechanized cleaning system is necessary for removal of contaminations.
In continuous seam welding, the wheels continue to roll as each weld is made. The high frequency process is still being used to manufacture pipe for use in new pipeline construction. Care is taken to eliminate contaminants between the faying surfaces. There is another way to do it as well in which workpieces are moved at a constant speed while the electrodes keep idling under the welding pressure. The type of weld in which the two workpieces slightly overlap along the edges is called as lap seam weld.
This technique is ideal for making gas or liquid tight vessels. By continuing to browse this site, you give consent for cookies to be used.
Wikimedia Commons has media related to Resistance welding. Energy is utilized efficiently in this technique. Typically, high weld energies at either short or long weld times, depending on physical characteristics, are used to produce fusion bonds.
Continuous Motion Seam Welding. For the geometrical welding configuration, see welding joint. The semi-molten surfaces are pressed together by the welding pressure that creates a fusion bond, resulting in a uniformly welded structure.
The electrode may need to be cleaned after one revolution. When the material passes between electrodes they rotate. This welding equipment include Welding electrodes made from copper which are in discs form Ac power supply source i. When the current is passed through the electrodes to the sheets, telecharger pdfgrabber 7.0 heat is generated due to the higher electrical resistance where the surfaces contact each other.
This article needs additional citations for verification. The electrodes may also move or assist the movement of the material. Usually, two copper electrodes are simultaneously used to clamp the metal sheets together and to pass current through the sheets. An alternative test is the restrained tensile test, which is much more difficult to perform, and requires calibrated equipment. It is used when fabrication of gas or liquid tight metal sheets are needed.
When current is applied then sheets are then mashed together which forms a solid-state joint. In other projects Wikimedia Commons.
Join The Discussion Cancel reply. Please help improve this article by adding citations to reliable sources. The joint formed due to this welding is not a leak tight joint. These typically focus on familiarization instead of memorization.
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