Fracture test revealing lack of fusion and porosity 

                                             

This test is performed to reveal internal imperfections such as slag inclusion, lack of fusion, incomplete penetration, porosity, etc in a butt weld. An artifical notch or a groove is intentionally introduced by a hacksaw or a cutting disc on the weld face, along the primary axis of the weld to facilitate fracture in the centre line of the weld. The depth of the notch is approximately 2 to 3mm depending on the thickness of the weld. In thin materials, the depth of the notch may be less than 2mm. The weld specimen is then mechanically bent to fracture along the weld centre line and the cross section is visually examined for imperfections. AS 2205.4.2 and ASME IX QW 182 are some of the common standard method utilised to perform this test.