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Joining of soft alloys such as copper and aluminium below their melting point Electrical contacts Diffusion welding: 45: DFW No weld line visible Titanium pump impellor wheels Explosion welding: 441: EXW Joining of dissimilar materials, e.g. corrosion resistant alloys to structural steels Transition joints for chemical industry and shipbuilding.
The HP-67 is a magnetic card-programmable handheld calculator, introduced by Hewlett-Packard in 1976 at an MSRP of $450. [1] A desktop version with built-in thermal printer was sold as the HP-97 at a price of $750. [2] Collectively, they are known as the HP-67/97. [3]
The tool center is typically placed in the centerline of the joint for similar joints such as aluminum/aluminium or copper/copper joints; in contrast, it is shifted towards the softer materials in DFSW called tool offset. [12] It is a significant factor to achieve a joint possessing smaller welding defect and higher mechanical properties.
Klimenko in the mid-1960s and patented in 1967, [7] experimentally proven and developed into a commercial technology at The Welding Institute (TWI) in the United Kingdom and patented again in 1991: the friction stir welding (FSW) process, [8] is a solid-state joining process that uses a non-consumable tool to join two facing workpieces without ...
Close-up view of a friction stir weld tack tool. The bulkhead and nosecone of the Orion spacecraft are joined using friction stir welding. Joint designs. Friction stir welding (FSW) is a solid-state joining process that uses a non-consumable tool to join two facing workpieces without melting the workpiece material.
Friction stir spot welds have a high strength, so they are even suitable for parts that are exposed to particularly high loads. In addition to automotive and rail vehicle construction, the aerospace industry is developing the process e.g. for welding cockpit doors for helicopters. [3]
Welding imperfections such as weld discontinuities. - Risk of welding in very short time. [67] Moreover research articles do not always describe the risks. Corner problem in friction welding with specific parameters time below 100 ms and conical contact surface. [67] There is a complete weld inside but corner is not welded.
A partially disassembled Curta calculator, showing the digit slides and the stepped drum behind them Curta Type I calculator, top view Curta Type I calculator, bottom view. The Curta is a hand-held mechanical calculator designed by Curt Herzstark. [1] It is known for its extremely compact design: a small cylinder that fits in the palm of the hand.
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