Quality control of welding seams

Methods for analysis and evaluation of welding seams

Applied standards

  • VT ISO17637
  • PT ISO3452
  • RT EN16016

Possible procedures:

Welding seams need to meet certain quality criteria or quality features in order to join components to fullfil the requirements over an expected lifetime.

HTV analyzes and evaluates welding seams using a variety of methods and procedures (destructive/non-destructive) to detect defects such as cracks, blowholes, bonding defects, inclusions or pores that adversely affect weld strength.

Crack of a welding seam through SEM
Root fusion defect of a welding seam via microscope

The detailed visual microscopic inspection enables, for example, the evaluation of the external appearance of the welding seam. Externally visible defects of the surface such as cracks, grooves, pores, corrosion etc. can be detected non-destructively and documented.

Metallographic analysis methods of microsection preparation and extended fine structure preparation (chemical/physical fine preparation techniques) make grain structures visible in the micrometer range. A subsequent high-precision examination using microscopy or XRF and SEM/EDX analyses provides clear identification of defects, for example in the seam structure or in the formation of the heat-affected zone.

The hardness profile of the welding seam is examined with the aid of instrumented penetration testing (nanoindentation). The base material, the heat-affected zone and the actual welding seam are analyzed in the cross section of the specimen with local accuracy.

Due to a variety of other methods, such as 2D/3D X-ray examinations, which is particularly suitable for the identification of blowholes and binding defects, HTV ensures a comprehensive and reliable quality control of welding seams.