RD&D-Programme 2004 - SKB

Macrospecimens in the cross-section of the weld are taken out of each trial weld in order to
analyze the relationship between parameter setting and weld shape and to study any discontinuities,
see Figure 6-12. A longitudinal section has been removed to study any variations in weld
depth. The shape, depth, width and root radius of the weld, based on the parameter settings, has
been studied and can be predetermined with high certainty. The root radius is also affected by
the design and wear of the cathode.
Macrospecimens in a longitudinal section from the weld show that the weld depth varies by four
millimetres from the unmachined surface, see Figure 6-13. The weld metal is very homogeneous
with microrpores with a diameter of less than 0.2 millimetres. The micropores are mainly
located in the root area.
Figure 6-12. Lid weld L027. Cross-section of weld. The macrospecimen shows a weld depth of
66 millimetres and the weld has a root radius of 1.5 millimetres, which minimizes the risk of root
defects.
Figure 6-13. Lid weld L026. Longitudinal section in weld, length approximately 200 millimetres.
The coarse structure shows the penetration of the weld.
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