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Guided-Bend  Test

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Figure  7-63.—Guided-bend  test  specimens. test piece by using a hydraulic press or similar machine. When the proper precautions are taken, a blacksmith’s forging press or hammer can be used to complete the bending operation. If a crack more than 1/16 inch devel- ops during the test, stop the bending because the weld has failed; otherwise, bend the specimen flat. After completing the test, measure the distance between the scribed lines and call that measurement (y). The percent- age of elongation is then determined by the formula: Requirements for a satisfactory test area minimum elongation of 15 percent and no cracks greater than 1/16 inch on the face of the weld. Guided-Bend  Test You  use  the  GUIDED-BEND  TEST  to  determine the quality of weld metal at the face and root of a welded joint. This test is made in a specially designed jig. An example of one type of jig is shown in figure 7-62. The test specimen is placed across the supports of the  die.  A  plunger,  operated  from  above  by  hydraulic pressure,  forces  the  specimen  into  the  die.  To  fulfill  the requirements of this test, you must bend the specimen 180 degrees—the capacity of the jig. No cracks should appear on the surface greater than 1/8 inch. The face- bend tests are made in this jig with the face of the weld in tension (outside), as shown in figure 7-63. The root- bend tests are made with the root of the weld in tension (outside), as shown in figure 7-63. Figure 7-64 shows a machine used for making the guided-bend test. It is used in many welding schools and Figure 7-64.—Testing machine for making guided-bend tests. 7-39



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