Stainless Steel Pipe Welding Procedures

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.

Stainless steel pipe welding procedures. The pipe welding techniques used and the procedure is also identical to the asme section ix pipe welding certification. Since welding pipe in the 6g position covers all of the pipe welding positions the information on this page can be applied to welding. 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. Welding on metal that is wet is strictly prohibited.

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. The preferred method for high purity food grade stainless steel is an autogenous tig square butt weld. Stainless steel alloys usually have a chromium content of a least 10. Stainless steel is generally helpful in welding.

4 stainless steel welding characteristics by definition stainless steels are iron base alloys containing 10 or more chromium which imparts to the metal the. Wet metal shall be heated until it is at least warm to the touch to assure removal of moisture. In resistance welding lower current can be used because resistivity is higher. Below is a basic step by step guide to follow when welding stainless steel.

In the welding procedure specification. When higher preheat is required by the applicable construction code i e. Stainless steels which require special welding procedures are discussed in later sections. How to tig weld stainless steel.

This process also uses shielding gas against contamination but you can weld thinner metals more efficiently. 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. Stainless steel base metals are grouped primarily into three classes depending on their crystal structure. Alternative gases that you can use are 98 argon and 2 co2 or 98 argon and 2 oxygen mix.

B31 1 b31 9 etc that preheat shall be used for production welding. 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. This numbering system will be used on all welding procedure specifications revised or developed in the future. The following describes the new numbering system welding procedure.

This is basically a common and unique process for joining stainless steel. Austenitic such as 302 304 308 316 etc martensitic such as 410 and 416 and ferritic such as 409 and 430. For everyone involved in any phase of welding steel structures engineers detailers fabricators erectors inspectors etc.