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13

Technical Services

Bend Testing Aluminum

Thickness of Specimen

Bend Mandrel Diameter

Materials

3/8

t

1-1/2

4t

M21 and M22

1/8

t (<1/8)

2-1/16

16-1/2t

M23* or F23 Welds

3/8

t

2-1/2

6-2/3t

M25 and Annealed M23*

*Note: Temper condition can also have an influence on the testing criteria.

When conducting bend tests, care must be taken to ensure the proper bending criteria are used. The following steps

should be taken to help ensure accurate bend test results.

1. Ensure proper test jig is used:

Wrap-Around Guided Bend Jig

(Preferred for Aluminum)

Sanding lines should be perpendicular to the weld

(in-line with the bending direction)

Plunger-Style Test Jig

(Not Recommended for Aluminum)

A radius should be applied to the edges of each bend

specimen per applicable specification

2. Review applicable code/specification to ensure the proper bend radius is used. Also note that this is where the base

and filler alloy combination affects the bend radius and sample thickness.

Excerpt from AWS D1.2: 2014

3. Ensure samples are prepared properly, according to the applicable code/specification, prior to bending.

Proper

Material Thickness

Bend Mandrel Diameter

Improper

Improper

Proper