1. Introduction
Cracking is a defect generated by a local rupture causing
discontinuities on the weld in the metal or on the adjacent
heat affected zone when freezing weld is solidified [10].
Cracking is considered one of the most serious defects of
welded joins, should be removed completely before putting
the product into use. Cracks may appear on the surface of the
weld, inside the weld and heat affected zone [10].
Cracks with different nature, positions and shapes, can be
microstructure cracks or cracking of crude crack. The crude
cracks can cause destruction of the structure in working. The
microscopic cracks in the process of structural work will
spread gradually forming crude cracks [6, 10].
Some cracks on the surface can be detected by means of
visual inspection. For microscopic cracks in the weld metal,
NDT methods such as magnetic, radiographic, ultrasound, etc.
can be used [5]. Depending on the cause, location and shape,
cracks generally have several categories such as: longitudinal
cracks, transverse cracks, branching cracks, crater cracks as
shown in Figure 1 [1, 10].
Manufacturing intentional crack welding’s defect welding
to do research in mechanical properties and to train NDT