The welding current is concentrated on the joint by a projection or profile on one of the individual parts.Flat electrodes can be used with a large contact surface area whose shapes match the area of the workpiece.The use of flat electrodes means longer shelf-life, virtually no deformation or discoloration on the workpiece and perfect fit in high-volume production applications.This resistance weld...

This resistance welding method allows a wide range of material types and shapes to be joint precisely, reliably and quickly.Sheets, sections, strips, stampings, wires or strands are welded very accurately between pointed electrodes.To avoid unwanted deformation on the outer surface of the workpiece, the contacting electrode is designed to provide the largest possible contact surface with this meth...

Very short process timeNo consumables, such as brazing materials, solder, or welding rodsOperator safety because of low voltageClean and environmentally friendlyA reliable electro-mechanical joint is formed

Production of seam welded Tubes: Welded tubes are produced by resistance seam welding. Tubes are produced from strips which are wrapped on spool with trimmed edges. The width of strip should be slightly bigger than the periphery of the tube to be produced to take care for the loss of metal in flashout. The strip is fed through set of forming rollers to form first the shape of the tube and then it...

Projection Welding: Projections are little projected raised points which offer resistance during passage of current and thus generating heat at those points. These projections collapse under heated conditions and pressure leading to the welding of two parts on cooling. The operation is performed on a press welding machine and components are put between water cooled copper platens under pressure. F...

Seam Welding: In seam welding overlapping sheets are gripped between two wheels or roller disc electrodes and current is passed to obtain either the continuous seam i.e. overlapping weld nuggets or intermittent seam i.e. weld nuggets are equally spaced. Welding current may be continuous or in pulses. The process of welding is illustrated in Figure 11.5. Fig 11.5: Process of Seam welding Fig 11.6...

Spot Welding In resistance spot welding, two or more sheets of metal are held between electrodes through which welding current is supplied for a definite time and also force is exerted on work pieces. The principle is illustrated in Figure 11.2. Fig 11.2: Principle of Resistance spot Welding The welding cycle starts with the upper electrode moving and contacting the work pieces resting on lo...

Resistance Welding Resistance welding processes are pressure welding processes in which heavy current is passed for short time through the area of interface of metals to be joined. These processes differ from other welding processes in the respect that no fluxes are used, and filler metal rarely used. All resistance welding operations are automatic and, therefore, all process variables are preset ...

1.Wire mesh welding machine can only be welded after passing water. The active parts of the welder should always be lubricated, the weldment should be cleaned after cleaning, so as not to damage the electrode or affect the welding electrode life. 2. When the wire mesh welding machine working at temperatures below zero degrees Celsius,welding should be completed after the use of compressed air...

Projection welding is a variation of the spot welding, usually impact bumps on one sheet among two sheets, then weld. Due to the current concentration so it overcomes the shortcoming of molten core offset in spot welding, therefore in projection welding workpiece thickness ratio may exceed 6: 1.When projection welding electrodes must be fallen rapidly with bumps crushing, otherwise it will splash ...