Narrow-gap joint geometry
Narrow-gap joint geometry is a narrow groove shape with parallel or slightly opened faces, suitable for thick-walled components. It reduces weld volume and thermal distortion through special welding heads.
Physical-Chemical Mechanism of Action
Narrow-gap joint geometry reduces the area between the pieces to be welded, which lowers the required weld volume. This leads to less thermal distortion, since less energy is needed to melt and join the metal.
Metallurgical Relevance & Welding Risks
Reducing weld volume can give better control over the welding process, improving weld quality. However, the risk of stress concentrations and cracks goes up if the faces aren't precisely aligned or if the welding force is too high.
Shop Practice & Action Guidelines
Use special welding heads with narrow gaps for narrow-gap joint geometry. Make sure the faces are precisely aligned and the welding force is controlled. Too high a welding force can cause stress concentrations and cracks.