Chapter 32 Flashcards
Destructive testing
Destructive testing entails loading the weld to the point that the sample piece fails. The main types of destructive tests are for tensile strength, shear, and weld uniformity.
Dye penetrant inspection
shows surface defects.
Free-bend test
The free-bend test can be done by using a vise or a special holding tool. The weld bead is ground until it is flush with the base metal surface. The grinding should be done so the grinding wheel marks run across the weld in the direction of the bead in order not to weaken the weld.
o The purpose of the free-bend test is to bend the weld specimen in order to check ductility.
Magna-flux
is used to determine the presence of fine cracks and other flaws.
Nick-break test
The nick-break test is done by notching the weld placement 1/4” to 3/8” on each side and then placing it in a press to rupture the weld specimen.
o The purpose of the nick-break test is to check the fractured weld surface for porosity, gas pockets, slag inclusions, overlaps, penetration, and grain size.
Nondestructive testing
employs various methods that evaluates welds without impairing their function and usefulness.
Shear test
Both a tensile strength test and a shear test require a tensile strength testing machine which can pull the welded piece until it breaks.
Tensile strength test
Both a tensile strength test and a shear test require a tensile strength testing machine which can pull the welded piece until it breaks.
Weld gauge
Use a weld gauge to check bead size and contour.
Weld uniformity
shows surface defects.
Dye penetrant inspection
is used to determine the presence of fine cracks and other flaws.
Magna-flux
employs various methods that evaluates welds without impairing their function and usefulness.
Nondestructive testing
