Weld Testing.ppt

8/14/2019 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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Documents

Weld Testing.ppt