Full-Field Strain Tensile Test of Weld Strength

Weld strength is a key indicator of weld quality. Conventional tensile testing usually captures strain data only at specific points and cannot fully reveal the strain distribution across the welded region. Full-field strain testing, by contrast, enables comprehensive strain analysis of the entire weld area during tension, allowing more accurate evaluation of the strength and reliability of welded joints.

The Haytham monocular 3D video extensometer employs advanced monocular 3D DIC technology to perform full-field strain measurement on the surface of welded parts. Its high-precision camera and image processing system capture the minute deformation of the weld region during tension and generate full-field strain distribution maps. Compared with conventional single-point or multi-point strain measurement, the 3D video extensometer delivers more comprehensive strain analysis results, with easy operation and no calibration required.

Specimen speckle preparation and on-site setup

In the weld strength tensile test, the specimen was fixed on a tensile testing machine and subjected to progressively increasing tensile load. The Haytham monocular 3D video extensometer monitored the strain distribution of the weld region in real time through its camera, accurately capturing the strain evolution of the welded joint under load and generating detailed full-field strain maps.

Analysis of the full-field strain data over the welded region identifies stress concentration areas and potential failure points of the welded joint. Full-field strain distribution maps help engineers gain deep insight into the strain behavior of welded joints under different tensile loads, providing data support for optimizing welding processes and improving weld strength. In addition, the test data can be used to validate mechanical models of welded joints and improve the prediction of weld quality.