Welding shipbuilding steel: WPS, heat input and hydrogen control

Define the procedure envelope

A welding procedure specification (WPS) defines process, consumable, joint preparation, preheat, interpass temperature and heat input. Qualification evidence must cover the production application under the project’s welding rules.

Manage cracking and toughness

Assess plate chemistry, thickness, joint restraint and hydrogen control together. Store and handle consumables to the manufacturer’s requirements; control moisture and surface contamination. Heat input affects cooling and heat-affected-zone properties, particularly on thermomechanically processed material.

Verify the joint

Inspect fit-up before welding, retain welder and procedure traceability, and apply the agreed nondestructive testing. Fatigue performance depends strongly on detail geometry and workmanship. Higher base-metal yield strength does not automatically improve a welded detail’s fatigue category.

Information to record

• Exact product standard and edition; approved drawing or specification revision.
• Grade, dimensions, final condition and heat-to-piece traceability.
• Acceptance test, inspection document and responsible approving party.

Frequently asked questions

Sources and reference scope

• Procurement and editorial guidance — Cross-checked against product terminology and the cited material rules
  Guidance describes checks to request. It is not a claim of available stock, certificates or completed project engineering.
• 钢材产品简介 — Slides 3, 5–6, 15–19
  Product forms, units and grade vocabulary; not proof of current stock or class certification.
• IACS UR W11 Rev.9 (May 2017) — Sections 1–8; chemistry tables 1–2 and mechanical tables 6–7
  Reference values are conditioned on grade, thickness, specimen and project rule. Not ASTM A131 acceptance data.
• 中外钢铁牌号速查手册（第4版） — PDF pp. 275–277; printed pp. 264–266, tables 5-4/5-5
  GB 712—2011 chemistry is historical reference, not a current contract standard. Table footnotes inspected.