Welding till the End!
Why Shielding Gases are required during welding: The process of welding is melting and solidifying of two metals together, during the process a molten weld pool is created which has to be protected from the atmospheric gases like oxygen and nitrogen otherwise contact of these gases with the weld pool may have adverse effects on …
To ensure the satisfactory performance of a component/structure, the component shall be tested with adequate testing procedure with the adequate testing method. Which in general specifies component can be used in the service requirement specified. Soundness to the purpose of component can be determined by either destructive or non-destructive testing of the component. But as …
ASME Boiler and pressure vessel code (BPVC) has assigned certain numbers to base metals to minimize the number of procedure and qualifications. Base metals are categorized as P No. is further divided in group numbers based essentially on comparable base metal characteristics, such as: Composition, Weldability Brazeablity Mechanical properties. Filler metals (electrodes) are categorized as …
P-Number, Group No, F-Number and A-Number in welding (ASME Section IX) Read More »
Preheating is the process involves heating the surrounding base metal near the joint to be welded, to a specific desired temperature prior to the welding or thermal cutting operation. Purpose of Preheat: 1) It raises the overall temperature of the material, which results in a slower cooling rate of the base materials, HAZ and the weld …
For fabrication of any equipment we require welders and welding operators must be qualified as per the qualification standard referred by the construction code. Whenever construction is as per ASME construction codes (like ASME B31.1, B31.3 or ASME section VIII) ASME section IX is used for the qualification of the procedure and welder. Welder is …
Welder Qualification (WPQ) as per ASME Section IX Read More »
This article is about diameter restrictions and position qualification involves in welder and welding operator qualification as per ASME Section IX. Diameter Restriction for Welder Qualification (as per QW-303) 1) If welder is qualified by groove weld during test, then the qualification range will be below (as per table QW-452.3 and table QW-452.6) Note: –There …
Welder Qualification-Diameter Restrictions and Position Qualified Read More »
In this article we will discuss the thickness qualification range of base metal and weld metal for Procedure qualification and Welder performance qualification as per ASME code. Thickness Qualification Limit for Procedure Qualification (PQR) 1) As per ASME Section IX a) For Groove Weld (As per table QW-451.1) Note- For PQR there is no any …
In this article we will discuss about the P91 material basics, welding requirement, consumable selection, welding process selection, microstructure, application. P91 Material The use of P(T)91 materials is worldwide. There are various sources for base materials, welding consumables, and fabrication or components. The art is such that few welding problems are encountered. The desire to …
In this article we have discussed about the difference between welder and welding operator, purpose of their qualification and how ASME section IX divided the welding in manual, semi-automatic, machine and automatic welding.
In this article we will discuss about the Supplementary Essential variables for GTAW, SMAW, SAW and GMAW welding process as per ASME BPVC Section IX for qualifying a groove weld PQR (Procedure Qualification Record). What is supplementary Essential Variable? A supplementary essential variables are those variable in which change will affect the toughness property of …
“Supplementary Essential Variable, ASME Section IX” Read More »