Thermal Stress Management in Wire Arc Additive Manufacturing

Wire arc additive manufacturing (WAAM) offers rapid, near-net-shape production of large metal components by depositing successive layers of wire feedstock melted by an electric arc. However, the highly localised heat input and repetitive thermal cycling generate steep temperature gradients, which in turn induce residual stresses and distortions that can compromise dimensional accuracy, mechanical performance and structural integrity. Effective management of thermal stresses in WAAM relies on understanding and controlling key process parameters—heat input, interpass temperature, deposition strategy and deposition pattern—to shape the thermal history and thus the stress evolution. Strategies include dynamic adjustment of arc power for each layer, optimisation of cooling intervals between passes, selection of tailored toolpath sequences and use of mechanical constraints or interlayer post-processing such as peening. Numerical techniques, most notably finite-element modelling, enable simulation of temperature fields, stress distributions and deformation modes, guiding process design and parameter selection. Concurrently, experimental characterisation through in situ thermography, contour-method stress mapping and X-ray or neutron diffraction provides validation and insight into microstructural effects. The global significance of thermal stress management in WAAM spans aerospace, marine and energy sectors, where performance-critical metallic parts benefit from reduced material waste, shorter lead times and lower production costs without sacrificing quality. By integrating computational prediction with adaptive process control, current research paves the way for industrially robust WAAM solutions that deliver repeatable, large-scale metal components with minimised distortion and optimised mechanical properties.

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Thermal Stress Management in Wire Arc Additive Manufacturing publication trend

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Technical terms

Residual stress: Internal stresses locked into a component after non-uniform thermal expansion and contraction during additive building.

Distortion: Permanent geometric deviation of a part from its nominal shape due to uneven thermal strains.

Deposition pattern: The sequence and direction in which successive material passes are laid down, influencing local heat accumulation.

Interlayer cooling time: The pause between successive weld passes, allowing partial heat dissipation to control temperature build-up.

Finite-element method (FEM): A numerical approach that discretises a component into small elements to simulate temperature, stress and deformation fields under process conditions.

References

1. Heat source management in wire-arc additive manufacturing process for Al-Mg and Al-Si alloys. Additive Manufacturing (2019).
2. Numerical investigation of a novel pattern for reducing residual stress in metal additive manufacturing. Journal of Material Science and Technology (2021).
3. Effect of Interlayer Cooling Time, Constraint and Tool Path Strategy on Deformation of Large Components Made by Laser Metal Deposition with Wire †. Applied Sciences (2019).