Process in which contacting metal surfaces are joined by heat from resistance to electric current
Spot welding (or resistance spot welding[1]) is a type of electric resistance welding used to weld various sheet metal products, through a process in which contacting metal surface points are joined by the heat obtained from resistance to electric current.
The process uses two shaped copper alloy electrodes to concentrate welding current into a small "spot" and to simultaneously clamp the sheets together. Work-pieces are held together under pressure exerted by electrodes. Typically the sheets are in the 0.5 to 3 mm (0.020 to 0.118 in) thickness range. Forcing a large current through the spot will melt the metal and form the weld. The attractive feature of spot welding is that a large amount of energy can be delivered to the spot in a very short time (approximately 10–100 milliseconds).[2] This permits the welding to occur without excessive heating of the remainder of the sheet.
The amount of heat (energy) delivered to the spot is determined by the resistance between the electrodes and the magnitude and duration of the current.[3] The amount of energy is chosen to match the sheet's material properties, its thickness, and type of electrodes. Applying too little energy will not melt the metal or will make a poor weld. Applying too much energy will melt too much metal, eject molten material, and make a hole rather than a weld.[4] Another feature of spot welding is that the energy delivered to the spot can be controlled to produce reliable welds.
^Larry F. Jeffus (2002). Welding: Principles and Applications. Cengage Learning. p. 694. ISBN 9781401810467. Retrieved April 18, 2014.
^robot-welding.com Archived January 17, 2010, at the Wayback Machine
^Joule effect, see Joule's laws
^US Patent 4456810, Adaptive Schedule Selective Weld Control, June 1984. "The weld process is stopped ... before the melt exceeds the electrode diameter. Otherwise, an impressive but totally undesired shower of sparks and hot metal will issue from the weld spot."
Spotwelding (or resistance spotwelding) is a type of electric resistance welding used to weld various sheet metal products, through a process in which...
methods include solvent welding (of thermoplastics) using chemicals to melt materials being bonded without heat, and solid-state welding processes which bond...
resistance welding process can be further classified by the geometry of the weld and the method of applying pressure to the joint: spotwelding, seam welding, flash...
Robot welding is the use of mechanized programmable tools (robots), which completely automate a welding process by both performing the weld and handling...
All sections contain welding specifications, however most relevant information is contained in the following: The American Welding Society (AWS) publishes...
Shot welding is a type of electric resistance welding which, like spotwelding, is used to join two pieces of metal together. The distinguishing feature...
Gas metal arc welding (GMAW), sometimes referred to by its subtypes metal inert gas (MIG) and metal active gas (MAG) is a welding process in which an...
Friction welding (FWR) is a solid-state welding and bonding process that generates heat through mechanical friction between workpieces in relative motion...
welding. Also known as manual metal arc (MMA) welding or stick welding. Also known as electric resistance welding (ERW). "جوشکاری گدازی FLOW Welding |...
interface of the two parts to be welded. Unlike in fusion welding, no liquid or molten phase is present in the joint. Cold welding was first recognized as a...
stir spotwelding is a pressure welding process that operates below the melting point of the workpieces. It is a variant of friction stir welding. In friction...
at The Welding Institute (TWI) in the UK in 1991. TWI held patents on the process, the first being the most descriptive. Friction stir welding is performed...
Plastic welding is welding for semi-finished plastic materials, and is described in ISO 472 as a process of uniting softened surfaces of materials, generally...
fixed by spotwelding or other means. An improvement over fishplate rail connectors is directly bonding rails together using thermite welding. In 1967...
years later, the first friction welding machine went into production. In 1971, the delivery of the first robotic welding system for the S-Class took place...
A welding power supply is a device that provides or modulates an electric current to perform arc welding. There are multiple arc welding processes ranging...
to weld than others (see Rheological weldability). A material's weldability is used to determine the welding process and to compare the final weld quality...
ultrasonic welding. Ultrasonic welding is a very popular technique for bonding thermoplastics. It is fast and easily automated with weld times often...
Autogenous welding is a form of welding in which the filler material is either supplied by melting the base material or is of identical composition. The weld may...
of spotwelding of aluminum. Clinching is used primarily in the automotive, appliance and electronic industries, where it often replaces spotwelding. Clinching...
Arc welding is a welding process that is used to join metal to metal by using electricity to create enough heat to melt metal, and the melted metals, when...
robot: Used for handling machine tools, spotwelding, die casting, fettling machines, gas welding and arc welding. It is a robot whose axes form a polar...
A weld nut is a special type of nut specifically designed to be welded to another object (spotwelding). There are various types for different applications...
business unit Perfect Welding provides products and complete systems - both manual and automated - as well as services in welding technology. Around 1950...
effectors An example of a basic force-closure end effector A spotwelding end effector A laser welding end effector A repair and observation end effector in...
Laser beam welding (LBW) is a welding technique used to join pieces of metal or thermoplastics through the use of a laser. The beam provides a concentrated...
two facelifts in 2012 and 2016. The 2016 facelift received additional spotwelding to strengthen the body. The vehicles also gained "Toyota Safety Sense"...
American Welding Society (AWS) D 1.4 sets out the practices for welding rebar in the US Without special consideration the only rebar that is ready to weld is...