Sus includes over 12% of chrome, and this chrome component protects the pipe from corrosion. Cr₂O₃ is formed on the surface of sus pipe so that the pipe prevents itself from corrosion. Sus pipe is composed of austenite and it is extremely durable against low / cryogenic temperature. The purpose of this guideline is to offer standardized working methods to maintain the proper quality of piping system. Stainless steel pipe is widely used for its strength against low temperature and corrosion, and it is mainly used for low-temperature and chemical products. To maintain these characteristics, special management is required in the process of storage, assembly, welding, and post-processing. Whereas for large-diameter pipes fully automatic methods are used.This guideline applies to stainless steel piping work during the fabricate & installation on board. TIG is widely used for stainless steel pipes of 4 inches and smaller sizes. The selection of welding method for joining stainless steel pipes is dependent on: Other forms of resistance welding are high-frequency resistance welding, percussion welding, etc. Continuous tube mills use this process quite extensively. The non-heat-treatable stainless steels are easily weldable by this process. All types of stainless steel can be welded using flash welding. The basic sequence of flash welding of stainless steel is:įlash welding machines are manual, semi-automatic, or fully automatic and can perform various additional operations like pre and post-heating, clamping, shearing, flash trimming, etc. In the flash welding process, the work parts initiate a flashing action from the current delivered through the clamped electrodes. The butt welding process can be grouped into two classes Flash Welding and upset Welding. Stainless Steel Welding by Butt Welding Process: Projection welding can be performed in almost all stainless steel. At these projections, heat is concentrated and can be made in one or both pieces as shown in Fig. Localized welding is performed at predetermined points by projections, embossments, or intersections. Projection welding is best suited for heavy-gauge stainless steel workpieces. Universal Welding of stainless steel with Projection Welding:.The parameters that affect the welding process are:Ī typical process of spot welding is shown in Fig. The welding cycle consists of squeeze time, weld heat time, hold time, and off time. The process uses two water-cooled electrodes or wheels which are brought together with the work parts using a mechanical force by foot, air, hydraulic, or motor-operated cam. The contour of the electrodes limits the shape and size of the welds. In spot welding of stainless steel, coalescence is produced by the heat generated from electric resistance and pressure on the electrodes. Butt Welding Welding of Stainless Steel using Spot Welding:.

The widely used resistance welding processes for stainless steel welding are:

For the mass volume of repetitive works, resistance welding for stainless steel products is particularly suitable.

One of the most economical and popular methods of joining stainless steel is by electrical resistance welding where heat is produced by the resistance to the flow of the electric current through the parts to be welded. 2: Welding of Stainless Steel-MIG & SAW Welding Stainless Steel by Resistance Welding

Weld stainless steel pipe