T.O. 33B-1-1
3-94
though the joint is perfectly sound. Such an indication may be produced in a friction or flash weld of
two dissimilar metals. (See Figure 3-46)
Figure 3-46. Magnetic Particle Indication at the Weld between a Soft and a Hard Steel Rod
d. The junction between two ferromagnetic metals by means of non-magnetic bonding materials, as in a
brazed joint. An indication will be produced though the joint itself may be perfectly sound. (See Figure
3-47)
Figure 3-47. Magnetic Particle Indication of the Braze Line of a Brazed Tool Bit
e. Segregation of the constituents of the metal, where these have different permeabilities, as for example,
low carbon areas in a high carbon steel, or areas of ferrite, which is magnetic, in a matrix of stainless
steel which is austenitic and therefore non-magnetic. Another example would be in the weld zone
and/or the heat-affected zone in welds between details of the same alloy. (See Figure 3-48.)
