While ASME publishes hundreds of standards, is the primary "qualification code" used globally for welding, brazing, and fusing. It does not dictate how to build a specific product—that is the job of "construction codes" like Section VIII (Pressure Vessels) or B31.3 (Process Piping)—but it defines the rules for ensuring a weld will be reliable. 1. Welding Procedure Specification (WPS)

The WPS is a written instructional sheet that guides the welder in production. It outlines all the parameters—essential, nonessential, and supplementary essential (if required)—that must be followed to ensure a code-compliant weld. Think of it as a certified recipe for a specific joint. Procedure Qualification Record (PQR)

Each code will reference Section IX for welding, but may add additional requirements (e.g., toughness testing, hardness limits).

To truly understand ASME welding standards, it's crucial to know that no single document does everything. There's a well-designed relationship between ASME's "construction codes" and its "qualification code."

A record of test coupon welding and mechanical test results. It the WPS. A PQR is not a WPS – it is evidence that a proposed weld joint can meet required properties.

For industrial welding fabrication, Part QW is the most heavily utilized section and is organized into four main chapters:

The PQR is a record of the variables used during the welding of a test coupon. It documents the actual values employed and records the results of destructive testing performed on the coupon.

ASME-WELD-2024-01 Date: [Current Date] Prepared For: Engineering & Fabrication Professionals Subject: Requirements, Application, and Qualification under ASME BPVC Section IX