Welding till the End!
The physical characteristics of materials that allow them to withstand applied forces or loads are referred to as mechanical properties. The performance of materials in diverse applications is greatly influenced by these properties. Mechanical properties of materials are very important for designing of machines tools and structure. Mechanical properties must be taken into account and …
In this article we will discuss about the taper transition requirement for dissimilar thickness as per ASME Section VIII Division 1: What is Taper Transition? Transition is formed by removing the material by grinding or machining from the thicker material section to match it with the thinner section’s thickness. When Taper Transition required? Taper transition …
Taper Transition Requirement for Dissimilar Wall Thickness Read More »
This article is regarding the benefits of weld consumable calculation. Steps to calculate weld consumable & we will calculate weld consumable for single “V” groove joint. In welding, weld consumable estimation plays the vital role for complete the fabrication within time frame and at the possible minimum cost of weld metal as other cost of …
Weld Consumable Calculation for “Single V Groove joint” Read More »
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: Filler metals (electrodes) are categorized as per F No. as per …
P-Number, Group No, F-Number and A-Number in welding (ASME Section IX) Read More »
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 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 »
In this article we will discuss about the required mechanical testing as per ASME BPVC Section IX for qualifying a groove weld PQR (Procedure Qualification Record), Location from where specimen to be taken, purpose and acceptance of mechanical testing. Testing Requirement: The type and number of test specimen required to qualify a groove weld PQR …
Mechanical Testing Requirement as per ASME BPVC Section IX Read More »
This article is about Welding Position involved in fabrication of Pressure Vessel, Piping and Pipelines. Different welding standard specifies different welding position for welder. Welding position is specified as per the position of work piece before and during welding. Position of welding is specified in ASME section IX and EN ISO 6947. Welding position is …
EN ISO 10204 is a standard that specifies requirements for the inspection and testing of metallic products. The differences between the various types of inspection certificates defined by EN ISO 10204 are as follows:
Carbon equivalent (CE) is a measure of the weldability of a material, particularly in relation to the heat affected zone (HAZ) during welding. It is a calculation that takes into account the carbon content, as well as other alloying elements that can affect the behavior of the material during welding, such as manganese, silicon, and …
What is carbon equivalent and how it affects weldability? Read More »
ASTM G48 is a standard test method that measures the resistance of austenitic stainless steel to pitting corrosion. The test method is used to evaluate the pitting corrosion resistance of materials in environments containing chloride ions. The ASTM G48 test involves exposing a sample of the material to a solution of ferric chloride (FeCl3) at …
IGC testing A262 Practice E refers to a standard test method used to evaluate the intergranular corrosion (IGC) resistance of stainless steel and high-alloy materials. This test method, described in Practice E of ASTM International standard A262, involves immersing specimens of the material in a solution of nitric acid and ferric nitrate.
Dilution is a term used in welding to describe the mixing of the base metal and filler metal during the welding process. In overlay welding, dilution refers to the extent to which the filler metal is mixed with the base metal.
Why PWHT Not Required in SS Post Weld Heat Treatment (PWHT) is typically not required in stainless steel. This is because stainless steel has a different microstructure compared to carbon steel, which makes it less susceptible to cracking and hydrogen induced cracking during welding. Additionally, stainless steel has a higher resistance to corrosion, which means …
Role of Delta Ferrite in Stainless Steel Welding
Delta ferrite is a type of ferrite, a crystalline structure that forms during the solidification of some metals and alloys, including stainless steel. The presence of delta ferrite in a welded joint of stainless steel is important because it affects the mechanical properties and corrosion resistance of the welded joint.
Ni Restriction in Sour Service Nickel (Ni) is restricted to a maximum of 1% in sour service due to its tendency to form brittle intermetallics with other metals in the presence of hydrogen sulfide (H2S). This phenomenon is particularly concerning in sour service applications, where H2S is present in high concentrations and can cause corrosion …
Why Ni is restricted up to 1% max. for sour service? Read More »
“Sour service” refers to a term used in the oil and gas industry to describe the conditions of a pipeline or well environment that contains hydrogen sulfide (H2S), a toxic and corrosive gas. Sour service can also refer to other corrosive environments that contain high levels of sulfur compounds. These conditions can pose a significant …