Subscribe to our newsletter to receive the latest news and events from TWI:

Subscribe >
Skip to content

Making calculations easier

Back to Pre-1998 Articles Adhesive technology demonstration centre Aged samples lend added credence to safety codes Arc welding Demonstration Centre shows best practice in action Boiler takes the heat in comfort Conductive adhesive for ultrasound catheter cracking-risk-in-steel-pipelines-from-external-hard-zones Engineering critical assessment of pipeline welds Far East fitness-for-purpose check First UK Research Council contract for TWI Friction stir welding of titanium Help with adhesives training Joining demonstration centres in industry Joining Forces success in Belfast Joints take 10 seconds in the microwave LIVEMAN - Advanced joining processes for lightweight vehicle manufacture Making calculations easier 'Mildly sour' environment project saves half a million pounds New standard for weld fracture toughness testing Novel method joins plastic pipes Plastics fume - new findings released Project saves time and money for Amerada Hess Small firms seize no-cost reviews and low-cost trials South East Asia ACFM course Space Shuttle technology transferred to power generation industry Spot the evidence Structural integrity assured for Liverpool Bay Supporting technology on the Indian sub-continent Technology demonstrators show best practice in action Thermomechanical material processing by friction [friction pillar processing] 'Tubestress' measures residual stresses in parts that other equipment cannot reach TWI enhances on-stream inspection service Underwater welding work expands at TWI North Wider recognition for welding inspectors

Making calculations easier

Connect, no.76, May 1996

To save time and effort in welding research and technology, TWI is currently undertaking a project to convert the leading microstructural predictive models into software programs. Over the past decade there has been an enormous increase in computer software available to help scientists and engineers.

Calculations are taken from the various disciplines of metallurgy, physics and chemistry to create a computer model for weld microstructures and weld deposits. This will guide engineers through the complicated calculations needed to understand the microstructures of fusion zones in welded joints.

Programmers at TWI allow for the variables which occur during welding, such as chemical composition, heat input and joint design. These correlate with the final microstructure (volume fraction, phase chemistries, particle sizes and distribution). This is just as accurate as traditional methods of calculation.

TWI's materials engineers are finding that, by using this new software, they can calculate at what compositions certain microstructures may be produced. This is useful where the exact compositional information is unavailable. For example, it is generally accepted that optimum levels of toughness in the weld metal are achieved when the microstructure contains (normally) over 70% a cicular ferrite. The computer model will validate any theoretical compositions.

By using this system, a welding engineer will save time and effort, and scientific investigations can be carried out faster and provide more information.

For further information, contact Martin Harvey:

For more information please email: