Stainless Steel Pipe Welding Procedures

The preferred method for high purity food grade stainless steel is an autogenous tig square butt weld.

Stainless steel pipe welding procedures.

This process also uses shielding gas against contamination but you can weld thinner metals more efficiently. Stainless steel alloys usually have a chromium content of a least 10. This is the intro page about welding pipe and how to pass the aws b2 1 6g e6010 open root and e7018 fill and cap pipe welding certification. Below is a basic step by step guide to follow when welding stainless steel.

4 stainless steel welding characteristics by definition stainless steels are iron base alloys containing 10 or more chromium which imparts to the metal the. This is basically a common and unique process for joining stainless steel. Backgroundthe new ncpwb welding procedure specification numbering system clearly defines the type of metals to be welded the welding process used and allows for identification of variations in a process. Stainless steel is generally helpful in welding.

Tig welding is traditionally used for welding stainless steel tube and pipe and remains the optimal solution for extremely high purity applications on tube or pipe at or below 6 inch diameter and schedule 10 wall thickness. Since welding pipe in the 6g position covers all of the pipe welding positions the information on this page can be applied to welding. Tig welding stainless steel is performed by using a non disposable tungsten electrode with a tig welder for striking up the arc. The new d1 1 spells out the requirements for design procedures qualifications fabrication inspection and repair of steel structures made of tubes plate and structural shapes that are subject to either static or cyclic loading.

B31 1 b31 9 etc that preheat shall be used for production welding. Stainless steels which require special welding procedures are discussed in later sections. This numbering system will be used on all welding procedure specifications revised or developed in the future. The pipe welding techniques used and the procedure is also identical to the asme section ix pipe welding certification.

Austenitic such as 302 304 308 316 etc martensitic such as 410 and 416 and ferritic such as 409 and 430. The following describes the new numbering system welding procedure. Wet metal shall be heated until it is at least warm to the touch to assure removal of moisture. In the welding procedure specification.

For everyone involved in any phase of welding steel structures engineers detailers fabricators erectors inspectors etc. Welding on metal that is wet is strictly prohibited. Stainless steel base metals are grouped primarily into three classes depending on their crystal structure. Mode of metal transfer.

Even though most of the welding machine manufacturers have included a table of materials and voltage settings in the machine it is highly important for you to pick the right kind of gas and electrode wire to be used for mig welding stainless steel. Less welding heat is required to make a weld because the heat is not conducted away from a joint as rapidly as in carbon steel. How to tig weld stainless steel.