bend

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Post on 22-Sep-2015

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bend test

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BEND TESTSObject: To determine the soundness of weld metal, heat affected zone and weld zone.These tests may also be used to give some measure of the ductility of the weld zone. It is not usual to use transverse and longitudinal bend tests for the same application.Method: All specimens to be removed and prepared without causing significant distortion or heating. The cap and root are ground flush. The specimen is bent by the movement of a former of prescribed diameter, the relevant side of the specimen to be placed in tension. Angle of bend and diameter of former should be as specified in the appropriate standard. Reporting Results:1. Thickness of specimen2. Direction of bend (root or face)3. Angle of bend4. Diameter of former5. Appearance of joint after bending e.g. type and location of flaws root bendface bend force force this side in tension for face bend F F this side in tension for root bend R R R RSurface in contact with former ground flat. . R = roller support F = former of specified radius SIDE BEND TESTObject: To determine the soundness of the weld metal and HAZ in a cross section. This may be preferred to the transverse bend test on thick materials. It is also used on processes or procedures expecting lack of fusion (e.g. thick plate using MIG).Method: The testing method is the same as that used for transverse bends except the cap and root are not ground flush, to allow testing across the complete weld.Report Results:1. Width and thickness of specimen.2. Angle of bend.3. Diameter of former.4. Appearance of joint after bending e.g. type and location of flaws. force 10mm F thickness of plate R R this side in tension for R = roller support side bend F = former of specified radiusTRANSVERSE TENSILE TESTObject: Used to measure the transverse tensile strength under static loading of a butt joint employing butt welds. The reduced section tensile test normally fails in the parent metal and so it is not designed to give the tensile strength of the weld. The radius reduced tensile test is a test of the as deposited diluted weld metal. The all weld tensile test, using a longitudinal section from the weld only, is used to check the as deposited undiluted weld metal. (Usually used by consumable manufacturers.)M