A WPS for A516 Grade 70 starts with the fabrication requirements
A Welding Procedure Specification is the written instruction used to control production welding. For A516 or SA-516 Grade 70 plate, the relevant question is whether the fabricator’s approved WPS and its qualification basis cover the proposed work—not whether a document happens to carry the same steel grade in its title.
This Gangsteel guide explains the documents a buyer should request and how their purposes differ. It is an information guide, not a qualified WPS or a production approval. The fabrication package needs the applicable construction Code, the required qualification standard and the procedures accepted for the actual job.
Three records answer three different questions
| Document | What it records or controls | Buyer’s review question |
|---|---|---|
| Welding Procedure Specification (WPS) | Production welding instructions and the applicable qualified ranges. | Does the approved procedure cover the joint and conditions proposed? |
| Procedure Qualification Record (PQR) | Actual variables used to weld a qualification coupon and the results of its required tests. | What evidence supports the procedure’s stated coverage? |
| Welder / welding-operator performance qualification | The person’s demonstrated ability to perform the relevant welding work. | Is the assigned person qualified for the work required? |
A PQR is evidence supporting the procedure, not a substitute instruction sheet for the production welder. Personnel qualification is separate again: a qualified welder does not automatically qualify a new procedure, and a qualified procedure does not automatically qualify every person assigned to use it.
ASME publishes suggested WPS and PQR formats. A blank form helps organize information; it does not establish qualification. The distinction remains practical: the WPS states the permitted production instructions, while the PQR records what was actually done and tested during qualification.
Use Section IX with the governing construction Code
ASME’s public description of Section IX identifies it as qualification rules for welding, brazing and fusing used when required by other BPVC sections. The project’s construction Code and year establish the governing framework, including whether Section IX is invoked and what additional production requirements apply.
The responsible welding or design engineer needs to review those requirements together. Qualification evidence alone does not settle every fabrication question: the construction Code may also address heat treatment, weld toughness or other production conditions. Select the project’s applicable editions rather than assuming the latest edition on sale is mandatory for every contract.
Review coverage against the joint, not just the grade name
Ask for the WPS identification and the supporting PQR references so that the relationship between the instruction and its evidence can be followed. Then compare the proposed work with the written coverage on the applicable qualification basis.
- Identify the welding process or processes and the proposed joint.
- Establish the plate designation, edition, thickness and actual delivery condition.
- Review the applicable base-metal grouping and thickness coverage with the responsible engineer.
- Compare the required fabrication PWHT condition with the procedure and its support.
- Include any toughness qualification required for the weld metal or heat-affected zone.
- Review personnel qualification separately from procedure qualification.
A change of material name is not, by itself, a complete coverage assessment. Whether one qualification supports more than one specified grade depends on the governing rules and the documented coverage. Leave that determination with the responsible engineer rather than inferring a grouping or qualified range from a supplier’s article.
What about a preliminary WPS?
In common qualification practice, the intended welding procedure is written before the coupon is welded, so the actual variables can be recorded and the required tests performed. The production WPS is then issued with the qualification support and applicable ranges established for it.
Whether a document must formally be titled “preliminary WPS” is a question for the applicable qualification standard and construction-Code edition. The useful buyer’s question is whether the planned procedure, coupon record, test results and released production instructions form a consistent, traceable package.
Keep the plate certificate and heat-treatment records in their proper roles
The mill certificate identifies the supplied material and its reported condition and test results. It is not a PQR and does not approve the fabricator’s welding procedure. For plate supply, identify ASTM A516 Grade 70 steel plate or ASME SA516 Grade 70 steel plate according to the project designation.
Mill normalizing, fabrication PWHT and heat treatment associated with forming are separate matters. A statement that a component was formed in a normalizing range does not, on its own, establish that the agreed material and fabrication requirements have been met. See ASTM A516 Grade 70 normalized for the plate delivery-condition question.
General material factors such as hydrogen control and the need for application-specific welding procedures are covered in ASME SA516 Grade 70 weldability. Keep those material considerations connected to, but distinct from, the qualification records.
Questions about Grade 70 WPS and qualification documents
Can this page be used as a production WPS?
No. It explains how to review the documentation, without specifying a production welding procedure. Use the fabricator’s approved WPS and its required qualification support under the governing construction Code. An article or a blank suggested form is not a job-specific approval.
Why is the PQR not the instruction for the production welder?
It records the actual conditions and test results of a qualification coupon. The WPS provides the production instructions and applicable ranges supported by that qualification. Reading the PQR alone can miss the permitted scope and additional project conditions that must be addressed in the approved WPS.
Does a qualified WPS also qualify the welder?
No. Procedure qualification and personnel performance qualification answer different questions. The first supports the welding procedure; the second demonstrates a person’s ability to perform the required work. Review both on the applicable basis rather than accepting one record as evidence for the other.
Is a formally named preliminary WPS always required?
That formal requirement must be established from the applicable qualification standard and construction Code. Writing down the proposed procedure before welding the qualification coupon is common practice. The buyer should look for a traceable progression from the intended procedure to actual coupon records, testing and released production instructions.
Does the plate’s impact certificate or normalized condition approve the WPS?
No. Those are material evidence and delivery-condition information. They may be important inputs to fabrication, but they do not replace procedure or personnel qualification. The project’s Code and approved fabrication documents determine how the supplied plate is to be welded and treated.
Send the material requirements that support the fabrication package
For a Gangsteel plate enquiry linked to welding work, include:
- Material designation, edition, dimensions and delivery condition.
- Construction Code and year, and the required qualification framework.
- Expected fabrication PWHT and any plate, weld or HAZ toughness requirements.
- Any agreed hardness, low-hydrogen or carbon-equivalent restrictions and material-document scope.
The fabricator’s responsible engineer should establish WPS/PQR coverage and personnel qualification for the production joint.
Availability, document scope and delivery terms are subject to the quotation for the specific order.