Cost Effective and Safe Welding Hardness Control

In this section

Back to Core Research Programme AMorph – 4D Printing for Field Morphing Structures Automation of Composite and Hybrid Joining Process Coaxial Wire Additive Manufacturing Processes and In-Line Monitoring Tools Development of Coded Excitation Technique for Non-Metallic Pipes Inspection Development of Digital Twin technology as a demonstrator for real-time integrity assessment of crack growth in tensile specimens Development of Friction Stir Welding (FSW) for Hydrogen Fuel Storage Tanks Development of Leak-Before-Break Hydrogen Storage Composite Pressure Vessels With Polymeric Liner Establishing Assessment Methods for Determining Safe Service Limits of High-Temperature Materials in Extreme Environments Fracture toughness in aggressive environments: effect of crack monitoring techniques on test results In-process detection and non-destructive testing of electron beam weld imperfections Internal Bore Coatings for Applications in Corrosion and Hydrogen Environment Joining of Additively Manufactured Materials Long term behaviour of polymeric liner materials/coatings in hydrogen service Techniques for High Temperature Ultrasonic Inspection of Arc Welding Ultimate Leverage Fund

Project Code: 0902-12

Objectives

The purpose of this work is to produce a simple and effective system whereby advantage can be taken of the interrelation between principal variables controlling weld area hardness. It is intended that this system will be able to be used to:

Extend the range of safe application of individual weld procedure qualifications.

Prevent hardness above safe levels from being generated in production welding.

Project Outline

The form of the nomogram that could be used to relate the chemical composition, pipe wall thickness, and welding heat input in weld procedure qualification and field welding has been devised in work performed for PRCI. A series of nomograms can be produced for typical welding scenarios using theoretical predictions, these will take the form shown in the Figure below.

Relevant Industry Sectors

Oil and Gas, Construction and Engineering

Technical and Economic Benefits

2000-3000 per re-qualification of a procedure which could be avoided, at 2001 prices.

Reduction in time taken to reach the final weld procedure.

A more informed definition of suitable combinations of essential variables will not only ensure the widest possible application of a procedure qualification, but should also help prevent hardness levels above this in the procedure qualification weld from being produced in production welding.

Industrial Member Report

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Improving Essential Variables for Hardness Control: A Feasibility Study