Our Testing Procedures
High Energy Metals, Inc. employs a wide variety of testing methods to guarantee the quality of both our bimetallic bonds and our finished products.
Contact Ultrasonic Testing
Automated Ultrasonic Continuous Scanning
A video of the plate scanning process:
Dye Penetrant Testing
Helium Leak Testing
Ram Tensile Testing
The standard mechanical test that HEMI uses to determine bond strength is the ram-tensile test. A specimen is machined from a bonded plate with a hole through the bond on one side. The opposite side has a larger diameter turned through the bond. This allows the specimen to sit in the testing fixture and the ram pressure forces apart the bond in tension. A successful test results in the metal fracturing before the weld.
Shear Strength Testing
HEMI’s routinely tests our explosively bonded material’s ability to resist shear forces. To perform a shear test, we machine a custom test lug and attempt to shear apart the metals along the bond-line. The test lug consists of a long strip of base metal and a machined strip of bonded metal with the explosive weld exposed. The lug is placed in a test fitting and force is applied using a hydraulic press. In a successful test, the base metal will shear off before the explosive weld. This indicates that the explosive bond is stronger than the base metal.
Bending is a common test HEMI preforms to verify the strength of our bonds. To perform a basic bend test, we cut out a thin strip of bonded material, notch tabs into it, and bend the tabs to different angles along the bond line. A strong bimetallic bond will not crack or break while being bent.
Some of HEMI’s custom ordered products need to be bent into their final configuration. We routinely build custom rigs to verify that our parts will survive the deformation and maintain the material’s desired properties.
Some of HEMI’s products, such as our threaded bosses, must withstand torqueing forces on a regular basis. To test a bimetallic bond’s resistance to torqueing, we machine a custom test plug and torque it until it fails. A successful test result will show a break in one of the base metals instead of the explosive weld. This indicates that the bond is stronger than the base metals.
Impact testing is a standard method of characterizing a material’s toughness. HEMI utilizes impact testing to verify that our explosive welds are tougher than the constituent metals. A successful impact test results in deformation or shearing in one of the base metals and not the bimetallic bond.