What Is Sfa In Welding

Electrodes and filler materials purchased for use at LANL shall be manufactured in accordance with the appropriate ASME SFA or AWS welding filler metal specification. The procurement document shall. Conforms to Certification: AWS A5.9 ASME SFA A5.9 Weld Process Used for Tig (GTAW) AWS Chemical Composition Requirements C = 0.03 max Cr =.

1. What Is Sfa In Welding Certification
2. What Is Sfa In Welding Supply
3. What Is Sfa In Welding Engineering

This article provides information about F number in WeldingProcedure Specification based on the requirement of ASME Code Section IX.

The F number grouping of filler metals refers to theirsimilarity on their usability characteristics. The usability determines theability of a welder to deposit a sound weld metal with a certain filler metal.

The F number is essential variable in the most weldingprocess for welding procedure specification and also in welding performancequalifications. Like the P number, the Fnumber designed to reduce the number of procedure qualification and weldingperformance qualification.

I have seen some many people confusing about F number andbelieving the F number is grouping for the similar chemical composition. Thisis not true, and F number is only about of usability characteristics such aswelding position.

F number in Welding Procedure Specification

Table QW-432 in ASME Code Section IX provides the list of Fnumbers. Any change from one F number in welding to the other F number is essentialvariable in the welding procedure specification. The changing from one F numberto other F number is a little bit different in welding performancequalification. The essential variable tables in welding performancequalification (QW-352 thru 357) refer you to the QW-433 for the range of qualification.

For example, a welder qualified with F number 4, he alsowill be qualified on the F numbers 1, 2 and 3.

Some contractors use the essential variable tables (QW-352thru 357) to minimize their costs. For instance, they might test the welder forstainless steel material by using carbon steel material. Consider the actualproject material is stainless steel and you do not want to waste stainlesssteel material for testing. You ask the welder to weld in carbon steel materialbut with stainless steel filler metal. Based on the essential variable table Pnumber 1 (Carbon Steel) qualifies P 8 (Stainless Steel), and the F number isthe same. So you qualify your welder for stainless steel material by usingcarbon steel material but stainless steel filler metal.

When you have a welder or welding operator with a certainqualification, and you want to use him in some other job, you need to see ifall the variables in the essential variable table confirm his qualification forthe new job. Each of the item in the table has veto right, if 6 out of 7 is Ok,but only 1 of them is not meeting the requirements, and then you cannot usethat welder in the new job and you need to re-qualify him by the new test.

The ASME Section IX Training Course is 2 days video training course and available online and the student that successfully pass the exam, receive I4I academy certificate with 16 hours training credit.

Related Links:

Nonessential Variables, Supplementary Essential Variables, A number in WPS

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ASME Boiler and pressure vessel code (BPVC) has assigned certain numbers to base metals as well as to filler metals (electrodes).

For base metals, ASME has assigned two number system, these are;

• P Numbers
• Group Numbers

For filler metals, the number system which is assigned, are as follows;

• F Number
• A Number

These numbers can be found in ASME BPVC Section IX, please see Table–1 for details;

Table – 1

BASE METAL GROUPING:

The main purpose of assigning this number system is to reduce the number of procedure qualification records (PQR). Conducting a procedure qualification requires a lot of time and money due to the following procedural requirements;

• Preparation of test coupon
• welding of test coupon and
• sending it to a lab for destructive test

Hence, to reduce these costly and time-consuming activities, ASME has done grouping of base metals and has assigned certain P numbers to each group of metals. This grouping of base metals has been done on the basis of the following parameters;

• Material composition
• Weldability
• Mechanical property

Though all materials of the same ‘P' number doesn't exhibit the same properties, but after considering the above-mentioned parameters, ASME has done this logical grouping.

Why this grouping is required?

Suppose, if we change the base metal from an existing qualified WPS and if the new base metal falls in the same ‘P' number then the requalification of the existing WPS is not required, it means no need for a new PQR.

But this doesn't mean that one can easily substitute the base material, from existing WPS, of same ‘P' number at any time. Whenever there is a change in the base material from existing WPS, the compatibility shall be considered with regards to the following factors;

• Metallurgical property
• Mechanical property
• Design considerations
• Service requirements
• Heat treatment

Table–2 shows the assignment groups for various metals and their alloys (according to ASME BPVC).

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What Is Sfa In Welding Certification

Table – 2

Now that we have understood ‘P' numbers let's move on to group numbers. Group numbers are subsets of ‘P' numbers assigned to ferrous based metals. Group numbers are assigned only to those materials which require toughness testing for the qualification of its WPS.

We will take an example of SA516 Gr 65 from table QW/QB-422 (Page – 118 of ASME Section IX, 2017 edition), we can find out the following values;

Base material – SA516 Gr 65

• Tensile strength (min.) – 65 Ksi (or 450 Mpa)
• P-No. – 1
• Group number – 1
• Nominal composition – C-Mn-Si
• Typical product form – Plate

Another grouping of base metals was the ‘S' numbers, but the ‘S' number is not used nowadays. It was deleted from ASME in 2009.

S Numbers were assigned to those materials which were acceptable for use by the ASME B31 Code for Pressure Piping, or by selected Boiler and Pressure Vessel Code Cases, but were not included in section II of ASME Boiler and Pressure Vessel (BPVC). Base metals that were previously assigned ‘S' Numbers were reassigned the corresponding P Numbers or P Numbers and Group Numbers.

FILLER METAL (ELECTRODE/WELDING ROD) GROUPING:

The F Number: F number grouping (for filler metals) is done to reduce the number of welding procedure specifications (WPS) and welder performance qualifications. The basis for F number grouping is usability characteristics. The usability characteristics fundamentally determine the ability of a welder to produce sound welds with a given filler metal. Hence it is assumed if a welder can make satisfactory weld with a particular filler metal, he will be able to weld with all the filler metals belonging to that particular ‘F' number.

Table-3 shows a brief summary of ‘F' and filler metals (according to ASME BPVC, Table: QW-432).

The F number grouping of filler metals refers to theirsimilarity on their usability characteristics. The usability determines theability of a welder to deposit a sound weld metal with a certain filler metal.

The F number is essential variable in the most weldingprocess for welding procedure specification and also in welding performancequalifications. Like the P number, the Fnumber designed to reduce the number of procedure qualification and weldingperformance qualification.

I have seen some many people confusing about F number andbelieving the F number is grouping for the similar chemical composition. Thisis not true, and F number is only about of usability characteristics such aswelding position.

F number in Welding Procedure Specification

Table QW-432 in ASME Code Section IX provides the list of Fnumbers. Any change from one F number in welding to the other F number is essentialvariable in the welding procedure specification. The changing from one F numberto other F number is a little bit different in welding performancequalification. The essential variable tables in welding performancequalification (QW-352 thru 357) refer you to the QW-433 for the range of qualification.

For example, a welder qualified with F number 4, he alsowill be qualified on the F numbers 1, 2 and 3.

Some contractors use the essential variable tables (QW-352thru 357) to minimize their costs. For instance, they might test the welder forstainless steel material by using carbon steel material. Consider the actualproject material is stainless steel and you do not want to waste stainlesssteel material for testing. You ask the welder to weld in carbon steel materialbut with stainless steel filler metal. Based on the essential variable table Pnumber 1 (Carbon Steel) qualifies P 8 (Stainless Steel), and the F number isthe same. So you qualify your welder for stainless steel material by usingcarbon steel material but stainless steel filler metal.

When you have a welder or welding operator with a certainqualification, and you want to use him in some other job, you need to see ifall the variables in the essential variable table confirm his qualification forthe new job. Each of the item in the table has veto right, if 6 out of 7 is Ok,but only 1 of them is not meeting the requirements, and then you cannot usethat welder in the new job and you need to re-qualify him by the new test.

The ASME Section IX Training Course is 2 days video training course and available online and the student that successfully pass the exam, receive I4I academy certificate with 16 hours training credit.

Related Links:

Nonessential Variables, Supplementary Essential Variables, A number in WPS

Did you find this article useful? Click on below Like and G+1 buttons!

ASME Boiler and pressure vessel code (BPVC) has assigned certain numbers to base metals as well as to filler metals (electrodes).

For base metals, ASME has assigned two number system, these are;

• P Numbers
• Group Numbers

For filler metals, the number system which is assigned, are as follows;

• F Number
• A Number

These numbers can be found in ASME BPVC Section IX, please see Table–1 for details;

Table – 1

BASE METAL GROUPING:

The main purpose of assigning this number system is to reduce the number of procedure qualification records (PQR). Conducting a procedure qualification requires a lot of time and money due to the following procedural requirements;

• Preparation of test coupon
• welding of test coupon and
• sending it to a lab for destructive test

Hence, to reduce these costly and time-consuming activities, ASME has done grouping of base metals and has assigned certain P numbers to each group of metals. This grouping of base metals has been done on the basis of the following parameters;

• Material composition
• Weldability
• Mechanical property

Though all materials of the same ‘P' number doesn't exhibit the same properties, but after considering the above-mentioned parameters, ASME has done this logical grouping.

Why this grouping is required?

Suppose, if we change the base metal from an existing qualified WPS and if the new base metal falls in the same ‘P' number then the requalification of the existing WPS is not required, it means no need for a new PQR.

But this doesn't mean that one can easily substitute the base material, from existing WPS, of same ‘P' number at any time. Whenever there is a change in the base material from existing WPS, the compatibility shall be considered with regards to the following factors;

• Metallurgical property
• Mechanical property
• Design considerations
• Service requirements
• Heat treatment

Table–2 shows the assignment groups for various metals and their alloys (according to ASME BPVC).

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What Is Sfa In Welding Certification

Table – 2

Now that we have understood ‘P' numbers let's move on to group numbers. Group numbers are subsets of ‘P' numbers assigned to ferrous based metals. Group numbers are assigned only to those materials which require toughness testing for the qualification of its WPS.

We will take an example of SA516 Gr 65 from table QW/QB-422 (Page – 118 of ASME Section IX, 2017 edition), we can find out the following values;

Base material – SA516 Gr 65

• Tensile strength (min.) – 65 Ksi (or 450 Mpa)
• P-No. – 1
• Group number – 1
• Nominal composition – C-Mn-Si
• Typical product form – Plate

Another grouping of base metals was the ‘S' numbers, but the ‘S' number is not used nowadays. It was deleted from ASME in 2009.

S Numbers were assigned to those materials which were acceptable for use by the ASME B31 Code for Pressure Piping, or by selected Boiler and Pressure Vessel Code Cases, but were not included in section II of ASME Boiler and Pressure Vessel (BPVC). Base metals that were previously assigned ‘S' Numbers were reassigned the corresponding P Numbers or P Numbers and Group Numbers.

FILLER METAL (ELECTRODE/WELDING ROD) GROUPING:

The F Number: F number grouping (for filler metals) is done to reduce the number of welding procedure specifications (WPS) and welder performance qualifications. The basis for F number grouping is usability characteristics. The usability characteristics fundamentally determine the ability of a welder to produce sound welds with a given filler metal. Hence it is assumed if a welder can make satisfactory weld with a particular filler metal, he will be able to weld with all the filler metals belonging to that particular ‘F' number.

Table-3 shows a brief summary of ‘F' and filler metals (according to ASME BPVC, Table: QW-432).

Table – 3

The ‘F' number grouping doesn't imply that one can easily substitute the filler metal (electrode/welding rod), from existing WPS, of the same ‘F' number at any time. Whenever there is a change in the filler metal (electrode/welding rod) from existing WPS, the compatibility shall be considered with regards to the following factors;

• Metallurgical property
• Mechanical property
• Design considerations
• Service requirements
• Heat treatment

The A Number: Another type of grouping for filler metal or welding rod is the ‘A' Number. ‘A' number grouping has been done on the basis of the chemical composition of the deposited weld metal. This can be found in ASME BPVC Section IX, Table – QW-442).

Please watch the video (given below) for more clarity on this topic;

Also read: Thickness range for welder qualification

Also read: Welding Symbols

What Is Sfa In Welding Supply

Also read: How to write a welding procedure specification

Also read: CSWIP Question Answers

What Is Sfa In Welding Engineering

Also read: Welding Electrodes/Filler metal