WELDING OPERATIONS I - OD1651 - LESSON 1/TASK 2
oxyacetylene torch. Each end of the weld at the joint is slotted
with a hacksaw or band saw as shown in figure 47. The specimen
is then bridged across two steel blocks, and struck with a heavy
hammer until the section of the weld between the slots fractures.
The metal thus exposed should be completely fused and free from
slag inclusions. The size of any gas pocket must not be greater
than 1/16 inch at its widest point. The number of gas pockets or
pores should not exceed six per square inch.
b Another break test method is used to determine the
soundness of fillet welds.
This is known as the fillet weld
break test. This test is performed by applying force on the apex
of the V shaped specimen with a hydraulic press or by striking it
with a hammer until the fillet weld ruptures.
The surfaces of
the fracture are then examined for the same defects mentioned in
the preceding paragraph.
FIGURE 47.
NICK BREAK TEST.
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