System Displays and Records Real-Time Video during Pipe InspectionsOfficial Interpretation: Aluminum Brazing Subject:Temperature Uniformity Re-quirements Code Edition:AWS C3.7M/C3.7:2005Code Provision:Page 4, Subclause 5.3.2(Temperature Uniformity Requirements)Inquiry:Do salt baths for brazing alu-minum having a solidus of less than1120°F have to meet a ±5°F, SAE/AMS2750, Pyrometry, Class 1 temperature uni-formity requirement?Inspection Trends / Winter 201113For info go to Response:Yes.
FeatureBy Inspection Trends / January 201114By Albert J. Moore Jr.Other than the measuring tape, thefillet weld gauge is the most usedmeasuring device in the weldinginspector’s kit. That is understandableconsidering the majority of the weldsdeposited are fillet welds. Yet manypeople measure the size of the filletweld incorrectly. The principle of the fillet gauge ispretty simple. The fillet weld has across section that is essentially atriangle. If the two members beingjoined are at right angles to each other,the cross section of the fillet weldresembles an isosceles right triangle —Fig. 1. One basic assumption is that thefillet weld is fused to the joint root, butnot necessarily beyond. With those twoassumptions in place, i.e., the crosssection of the fillet weld is an isoscelesright triangle and it has fusion to theroot, we can establish a relationshipbetween the length of the fillet weldlegs and the theoretical throat. We needto know the dimension of the throatbecause it is the “weak link”; that is, itrepresents the shortest failure paththrough the cross section of the weld.With the two conditions noted in place,we can define the size of the fillet weldas the largest inscribed isosceles righttriangle.Inspectors usually use a leaf-typefillet weld gauge to measure the size offillet welds. The gauges come as a setof individual gauges that are used tosize fillet welds. I did not say“measure” fillet welds because theleaf-type gauge only indicates whetherthe weld is less than, larger than, or thesame size as the gauge. The inspector checks the size of