A floor joist including a first piece of lumber including a first set of fingers and a first set of grooves is provided. A second piece of lumber including a second set of fingers and a second set of grooves is also provided. A finger joint is formed by a combination of the first second of fingers with the second set of grooves and a combination of the second set of fingers with the first set of grooves. A first set of pockets are formed between the combination of the first second of fingers with the second set of grooves, and a second set of pockets are formed between the combination of the second set of fingers with the first set of grooves.

A fixed value residual stress test block, comprising a main body (1) and two welded blocks (2); the main body (1) and the welded blocks (2) are all rectangular metal blocks; the welded blocks (2) are welded onto the two opposite side surfaces of the main body (1); the main body (1) is deformed under the upper and lower pressures and generates residual stress. The fixed value residual stress test block has a simple structure.

A floor joist including a first piece of lumber including a first set of fingers and a first set of grooves is provided. A second piece of lumber including a second set of fingers and a second set of grooves is also provided. A finger joint is formed by a combination of the first second of fingers with the second set of grooves and a combination of the second set of fingers with the first set of grooves. A first set of pockets are formed between the combination of the first second of fingers with the second set of grooves, and a second set of pockets are formed between the combination of the second set of fingers with the first set of grooves.

An assembly for testing a quality of a weld joining a first section of tubing to a second section of the tubing includes a track, a first tubing engagement structure coupled to the track and translatable along the track, a second tubing engagement structure connected to the track, an actuator, and a load cell. The actuator is operable to translate the first tubing engagement structure along the track in a first direction toward the second tubing engagement structure and in a second direction away from the second tubing engagement structure. The load cell is operable to measure at least one of a compression load and a tensile load applied to the tubing by the first and second tubing engagement structures.

A system and method for evaluating a bond is provided. The system uses an adjustable submerged plasma probe to generate a compression wave in a first vessel containing a liquid. The system further includes a second vessel in which a vacuum is pulled to hold the first vessel against a bonded structure being inspected. The compression wave is directed to propagate from the liquid into the bonded structure to apply a known force to the bond being inspected. The adjustable submerged plasma probe allows the intensity of the compression wave to be increased or decreased at the bonded structure.

A method used to predict a strength of an ultrasonic weld-joint of a wire-cable comprising the steps of providing a wire-cable, determining a combined-weight, removing a contaminant, removing a solvent, determining a weight, determining a percentage by weight of the contaminant, and determining whether the percentage by weight of contaminant is less than a threshold. Determining the percentage by weight of the contaminant removed from the wire-cable is based on a formula [(MbMa)/Mb]*100, where Mb is the combined-weight of the wire-cable and the contaminant and Ma is the weight of the wire-cable. The threshold of the percentage by weight of the contaminant correlates to the strength of the ultrasonic weld-joint.

A method used to predict a strength of an ultrasonic weld-joint of a wire-cable comprising the steps of providing a wire-cable, determining a combined-weight, removing a contaminant, determining a weight, determining a percentage by weight of the contaminant, and determining whether the percentage by weight of contaminant is less than a threshold. Determining the percentage by weight of the contaminant removed from the wire-cable is based on a formula [(MbMa)/Mb]*100, where Mb is the combined-weight of the wire-cable and the contaminant and Ma is the weight of the wire-cable. The threshold of the percentage by weight of the contaminant correlates to the strength of the ultrasonic weld-joint.

A fixed value residual stress test block, comprising a main body (1) and two welded blocks (2); the main body (1) and the welded blocks (2) are all rectangular metal blocks; the welded blocks (2) are welded onto the two opposite side surfaces of the main body (1); the main body (1) is deformed under the upper and lower pressures and generates residual stress. The fixed value residual stress test block has a simple structure.

A device for evaluating quality of welding spots of a panel is disclosed. The device includes a vibration transferring member, a first access member contacted with one surface of one end portion of the vibration transferring member and with the one surface of the panel, a second access member contacted with one surface of the other end portion of the vibration transferring member and with the one surface of the panel, an oscillator for supplying vibration to the one end portion of the vibration transferring member, a sensor disposed on the vibration transferring member to detect characteristic of vibration transferred along the vibration transferring member, and a computing device for analyzing characteristic of the welding spots using characteristic of vibration detected in the sensor.

A test piece preparation step of preparing a test piece (50) including a welding structure in which a welding material formed of an austenitic alloy is welded to a member formed of low-alloy steel or low-carbon steel, a hydrogen supply step of supplying hydrogen to the test piece (50), and a characteristic stress acquisition step of applying a load (F) to the test piece (50) to which hydrogen was supplied and acquiring a characteristic stress showing material mechanical properties of the test piece (50) are executed.