WPQR

[Akendewa]

All,
One quick question:
A welding procedure normally covers a certain range of thicknesses....
Is it the same for Base metal Grade???? or any welding procedure done for example on A333 Grade 6 steels can be used for A572 Grade 50.

Many thanks,

Ak

 

[metengr]

Typically, welding procedure specifications (WPS) under an international standard (Like AWS or ASME B&PV Code, Section IX) provide information for both weld deposit thickness and base metal thickness qualified. To reduce cost and number of redundant welding procedures, there is a grouping system developed to classify similar weldability of base materials for a WPS.

 

[gtaw]

Depending of the welding standard, base metals are grouped together to limit the number of qualification tests required to meet production requirements. AWS D1.1 groups them together based on carbon equivalency and similar "weldability". ASME groups the base metals by P numbers, AWS B2.1 groups them by their M number, and NAVSEA by their S number. Generally, the materials in each group, i.e., P, m, or S numbers, have similar chemistry and mechanical properties (similar, but not necessarily the same).

Best regards - Al

 

[Akendewa]

Thanks All...really appreciated.

 

[TOVmania]

Watch out for filler metal chemical matching property with the base metal. You can never think one fits all within the same group.