Projection Welding Theory

Project Report 1. Be sure the breathing air is safe.

Resistance Welding Working Principle Different Types And Applicaitons

The welding is a process of joining two or more similar or dissimilar metals by heating them to a suitable temperature with or without the application of pressure filler material and flux.

Projection welding theory. GAS WELDING Oxy-Acetylene welding is one of many types of welding supported by the PRL. Normally flat electrodes with diameter larger than the work piece are used. At present the work parts held among electrode as well as a huge quantity of current flow through it.

What is Projection Welding. One of the pieces to be welded this way has projections produced by pressure. Project Report on the Practical Applications of Welding.

This concentrated current on the small projected contact area generates. The electrodes are placed on work piece and current passed between them. The projection is about defining a place where the weld joint should be created.

In fact the oxy-acetylene flame burn at 6000 F and is the only gas flame that is hot enough to melt all commercial metals. Welding symbols provide the means of placing complete welding information on drawings. One is the inability to contain the molten weld nugget as it is forms.

The electrode geometry and size is only necessary to deliver current and force to the part. When projection welding high impact will damage the projection before welding and result in poor projection welds even when all other settings are correct. Without application of welding curren andthe projection is compressedand intended into the surface of the mating workpieces Fig.

The electrodes are flat. The heat and rays of the arc can react with vapors to form highly toxic and irritating gases. Burrs in projection welding be it Capacitive Discharge AC or MFDC resistance welding are caused by several factors.

In projection welding heat balance and X theory are not necessary because the projection is designed to concentrate the heat where you need it at the faying surface. Welding fumes and gases can displace air and lower the oxygen level causing injury or death. Do not weld in locations near degreasing cleaning or spraying op-erations.

Projection Welding Projection welding is similar to spot welding apart from a dimple can be generated on work parts at the place wherever weld is preferred. A very important factor is that the full force must be maintained on the projections as they collapse. The Solenoid Valve is an electrically operated air valve in the compressed air line connected to the air cylinder on the welding machine.

When the welding control applies voltage to this valve. As you might be aware set-down is a measurement of the amount of collapse when the projections melt. Resistance welding is classiﬁed into resistance spot welding RSW and resistance projection welding RPW depending on the existence of a projection.

In projection welding the pieces are held together or clamped together between the electrodes and the pressure will be applied. As the current flows through the welding zone of whichthe path is constrained by the contact the temperature around the projection elevates rapidly. The most important variables of this assembly technique are the quality of the projections and the response of the cylinder as the projection collapses during the welding time.

It is infact a modified form of the spot welding. Another is the weld interface may have been overheated. Do not weld on coated metals such as.

Collapsed during tltis stage Fig1c2. It is extremely versatile and with enough skill and practice you can use this types of welding for virtually any metal. In theory set-down might be used as another indicator of weld nut torque limits but this presumes the projections are properly formed and the welding process is well controlled.

Welding Theory Page Navigation 30 31 32 33 34 35 36 37 38 39 40. Projection welding has fewer variables that affect the resistance welding process as compared to spot welding. Projection welding is a resistance welding process for joining metal components or sheets with embossments by directly applying opposing forces with electrodes specially.

The scheme for symbolic representation of welds on engineering drawings used in this manual is consistent with the third angle method of projection. In the Projection welding the projection is provided to the materials to be joined or workpieces. In RPW projection forms at welding position on a plate where current is concentrated to induce local heat generation.

Introduction To Spot Welding Working Principle Of Projection Welding