Fillet Weld Break Test

7/24/2019 Fillet Weld Break Test

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Fillet Weld Break Test – This type of testing involves breaking a sample fillet weld that is welded on

one side only. The sample has load applied to its unwelded side, transverse to the weld and directed

to its unwelded side (typically in a press). The load is increased until the weld has failed. The failed

sample is then inspected to establish the presence and extent of any welding discontinuities. This

test will provide a good indication as to the extent of discontinuities within the entire length of weld

tested (normally 6 to ! inches) rather that a cross"sectional snapspot like the macro etch test. Thistype of weld inspection can detect such items as lack of fusion, internal porosity and slag inclusions.

This testing method is often used in con#unction with the macro etch test. These two testing methods

complement each other by providing information on similar characteristics in different detail and in

different ways.

Fillet Weld Break Test The specimen for this test is made as shown inFigure 23-32A. In Figure 23-32B, a force is applied to thespecimen until the specimen ruptures. Any convenient

means of applying the force may be used, such as an arborpress, a testing machine, or hammer blows. The breaksurface should then be examined for soundness—that is,slag inclusions, overlap, porosity, lack of fusion, or otherdiscontinuities.

Fillet-Welded Joint Test



You use the FILLET-WELDED JOINT TEST to check the soundness of a fillet weld.

Soundness refers to the deree of freedo! a weld has fro! defects found "#

$isual ins%ection of an# e&%osed weldin surface. These defects include %enetrations'

as %ockets' and inclusions. (re%are the test s%eci!en' as shown in fiure )-*+. Now

a%%l# force at (oint ,

Fiure )-*+.-Test %late for fillet weld test.



Fiure )-*.-u%turin fillet weld test %late.

/fi. )-*0 until a "reak occurs in the 1oint. This force !a# "e a%%lied "# h#draulics or

ha!!er "lows.

In addition to checkin the fractured weld for soundness' now is a ood ti!e to etch

the weld to check for cracks.

FILLET WELD BREAK TEST

A test in which the specimen is loaded so that the

weld root is in tension. See STA!A"! #$%!I& T$"'S.

FILLET WELD SIZE For equal leg fillet welds, the leg lengths of the

largest isosceles right triangle that can be inscribed

within the fillet weld cross section. For unequal leg

fillet welds, the leg lengths of the largest right triangle

that can be inscribed within the fillet weld cross

section. See STA!A"! #$%!I& T$"'S. See Appendix((.FILLET WELD STRENT!

In structures or systems where service stresses arehigh, such as in heavy machinery, ship and buildingconstruction, extensive framework and intricate angles

may include miles or more of welded )oints. Shearingstresses can a*ect a large percentage of the total systemof welds. +orrect design of a llet weld on anglesimplies an optimum balance between the e*ectiveweld length and the contact area between the weld andeither base metal part.A sound engineering approach is mandatory, andallowable shearing stresses must be accurately calculatedto specify weld si-es and length which will resultin the most economical application of strength, )ointeciency, and safety in service.In dealing with angles, the welded )oints must be

proportioned correctly and designed to reduce internalstresses and strains which often cause buckling, distortion,and ultimate failure. These stresses are due to thedi*erential expansion occurring with the heating orcooling of a weld.#hen designing a llet weld, weldability must be aconsideration. A careful investigation must includeindividual welding conditions, e.g., design of the



workpiece or structure, section thickness, accessibility,service re/uirements, and manufacturing cost. It isessential to consider the si-e instead of the throat of allet weld.In llet welds in which the cross section is an e/ualisosceles right triangle, the throat is e/ual to the product

of the si-e and sine 0123 T 4 L sine 012 4 5.656%.See Appendix 11. Any weld metal outside the trianglelimits is omitted in estimating weld strength, sothe material between the dashed line and the curvedsurface of the weld is considered extraneous and disregarded.

Theconvexity of a llet weld should bereduced, since a 012 7at llet is the most desirableshape for weld performance. 8or e/uivalent strengthand rigidity, long llet welds with smaller leg si-es arethe most economical.



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Fillet Weld Break Test