Fry.Standardisation in High Temperature Corrosion Testing.ppt
Weld Testing.ppt
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Weld Testing
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Weld Testing
Nondestructive
Destructive
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Nondestructive Testing
Helps locate defects without damage tothe weld.
Welds can be repaired or replaced.
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Nondestructive Methods
Visual Inspection (VT)
Magnetic Particle Inspection (MT)
Liquid Penetrate Inspection (PT)
Ultrasonic Testing (UT)
Xray or Raidograph (RT)
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Visual Inspection
Tested Visually
Tested for size, conformation, porosity,
undercut, cracks, ect
Usually requires gauges, calipers, and scales.
(can include cameras)
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Magnetic Particle Inspection
Checks for surface or near surface flaws.
Magnetic current is applied to the metal
surface. A magnetic liquid or powder isthen applied to locate cracks.
Portable and can be moved to the job site
Material must be magnetic.
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Liquid Penetrate Inspection
Cheap way to see surface flaws in manydifferent material.
Liquid penetrate is applied and allowed tosoak into cracks.
Excess is removed.
A developer is applied to allow cracks tobe seen.
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Ultrasonic Testing
Finds flaws by sound waves introduced at1 million Hz.
Can find deep or hidden flaws.
Is fast with immediate results.
Has trouble with flaws parallel to thesound waves.
Takes a great deal of expertese to read.
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Radiograph or x-ray
Based on x-ray technology. Shades onfilm are lighter as density increases.
Flaws can be found but their depth is hardto determine.
*Radiograph gives you a permanent
record of the flaws or lack of. (it isrecorded on film.
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Destructive Methods
Bend tests
Tensile Test
Impact Test
Hardness testing
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Bend Tests
Face and root bend test
Side bend test
Fillet weld bend test
Unguided bend test
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Tensile Testing
Sample is pulled until it breaks and then atensile strength is determined.
Specimen is machined to a desired sizeprior to testing
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Impact testing
Material is subject to an impact to test itstoughness.
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Hardness testing
Usually used for base material testing butcan also can help determine a heat
effected zone of a weld.
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