Structural Welding




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Section IX of the ASME BPVC

ASME P-Numbers

Structural Welding







Structural Welding Codes

There are several Structural Welding Codes.  This web page provides an outline of the Structural Welding Codes.  Typical examples of these are listed below:


The Structural welding Codes cover various aspects for fabricating and erecting welded structures.  While there are changes to the Codes from time to time the outlines here provide an overview of the information in the codes.

For comparison the Structural Welding Codes are more comprehensive than Section IX of the ASME Boiler and Pressure Vessel Code (BPVC), as issues such as design and fabrication are addressed in other sections of the ASME BPVC.  Some examples of welding requirements addressed by the Structural Welding Codes include:

  • Design of welded connections

  • Requirements for Welding Procedure Specifications (WPS)

  • Requirements for Welding Personnel Performance Qualification

  • Fabrication Requirements

  • Inspection

Weld Design

Engineers typically design welded connections in accordance with the requirements identified in the welding code.  The codes address various aspects of the weld.  Some of the weld issues specified are listed below

  • Groove welds

  • Fillet welds

  • Weld length

  • Complete joint penetration

  • Partial joint penetration

  • Lap joints

  • Weld size

  • Weld spacing

  • Transitions

  • Static and cyclical loading


Welding Procedure Specifications (WPS) and Welding Personnel Performance Qualification are required.  The qualification covers various aspects concerning the production of welds.  Some of these items are listed below:

  • Welding Process (SMAW, GMAW, FCAW, GTAW, SAW etc.)

  • Base metal

  • Filler metal

  • Preheat and Interpass temperature

  • Amperage

  • Voltage

  • Travel speed

  • Shielding gas

  • Thickness

  • Welding position

  • Backing

Requirements for Welding procedure Specifications and Welding Personnel Performance Qualification are identified in the Codes.


Fabrication and erection of welded assemblies and structures are detailed in the code.  Some of the items covered by the code are listed below

  • Base metal

  • Welding consumables

  • Preheat and Interpass temperature

  • Stress relief heat treatment

  • Backing, backing gas, or inserts

  • Welding environment

  • Design compliance

  • Preparation of base metal

  • Dimensions and Tolerances

  • Weld profile

  • Repairs  


Requirements for the Inspector's qualifications and responsibilities, acceptance criteria for discontinuities, and procedures for nondestructive testing (NDT) are identified in the Code.  Some of the items identified in the code are listed below:

  • Inspector

  • Materials

  • WPS

  • Equipment

  • Welder Qualification

  • Welds

  • Records

  • Acceptance Criteria

  • Alternate Acceptance Criteria

  • Liquid Penetrant Testing

  • Magnetic Particle Testing

  • Radiographic Inspection

  • Ultrasonic Inspection


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Copyright 1999 Robert McCabe                    
Last modified: February 17, 2015