Trial welding

FIGURE 4.117 Trial welding with (a) and without (b) subsequent annealing treatment... 

Just what did the trial court do with the patent It held first of all, that an invention of great merit had been made and recognized that the patentees had been able, by the use of their improved fluxing composition, to conduct their electric arc-welding operation without glare, with no open arc, no splatter, and very little, if any, smoke. Further the performance achievement was held to be far superior to what had gone be-... 

Trivex Pins. Friction stir lap welding trials with the MX Trivex pins (see the section Trivex Pin in this chapter) (Ref 105) were performed because the MX Trivex pins showed less vertical movement than Triflute tools (Ref 93). However, not all of the downward interfacial movement could be eliminated with the MX Trivex pins. The MX Trivex pins produced as much as 1 mm (0.04 in.) of retreating side plate thinning (on 6.35 mm, or 0.25 in., thick plates). However, the fatigue results demonstrate that the MX Trivex pin is comparable to the A-Skew pin (see the section Skew-Stir Tool in this chapter). The best fatigue results were produced with the Re-Stir tool (see the section Re-Stir... 

W.M. Thomas, C.J. Goodfellow, D.G. Staines, and E.R. Watts, Preliminary Trials Using Dual-Rotation Stir Welding, Romanian Welding Society Conference, Sept 28-30, 2005 (Galati, Romania)... 

Shoulder-First Refill. Allen et al. (Ref 7) performed weld trials using the shoulder-first refill method in 2 mm (0.08 in.) thick upper and lower sheet 7075-T6 aluminum lap welds under forge control mode. A large effective shear area was formed and a high degree of refill achieved (Fig. 12.26). 

Feng et al. (Ref 35), conducted a preliminary study to investigate the feasibility of FSSW of AHSS sheet metal. The objective was to weld 600 MPa (87 ksi) dual-phase steel and 1310 MPa (190 ksi) martensitic steel. A single tool, made of polycrystalline cubic boron nitride, survived over 100 welding trials without noticeable degradation and wear. The tool had a tapered pin,... 

Fig. 13.33 The Eclipse 500 business-class jet is currently in final Federal Aviation Administration certification trials (left). The internal longitudinal and circumferential aluminum stiffeners (top right) and window and door doublers (bottom right) are attached to the aluminum fuselage section with friction stir welded lap joints. Courtesy of Eclipse Aviation...

Inspection is of importance to ensure that fabricators are working according to design codes and quality control. Assembled items are of the right material and specifications for common items such as valves, piping, and welding electrodes must correspond to the standard prescribed specifications. It may be necessary to perform trial runs with the equipment supplied by manufacturers before full-scale operations. 

These three settings can vary and are determined for each application or part by trials. In order to reproduce the predetermined values, they are carefully registered. Because some areas to be welded are different in nature, geometry, material and surface, an experienced technician is usually needed to determine the settings of the machine through experimentation. 

These site trials are presently treating the recording system us a back-up facility for the site analysis. Recordings have been made of an Inspection of certain welds in the gets ducts at a Magnox power station. 

This inspection was carried out in a limited access period, and the recording heis proved of value in verifying the site calibration accuracy as well as providing more detailed defect information. The first site trials of this equipment were on reactor standpipe welds. These recordings have provided sufficient help in the weld defect analysis to warrant the use of... 

This application was part of the PlSC 11 trials (Ref 1) at the Non-Destructive Testing Centre of the CEGB. The PISC II trials are an attempt to determine the reliability and accuracy of the ultrasonic sizing of defects in PWR vessels by using test specimens with simulated defects. The particular inspection that SAFT was used in was the reactor/nozzle weld inspection. 

High levels of noxious odors and concerns over worker safety have resulted in acrylic adhesives being removed from consideration in automotive hem bonding plans (9). They were rejected despite a five-year development program that showed that replacing spot welding with a rapidly fixturing adhesive would substantially lower hood and lid assembly costs. However, an aerobic acrylic similar to the B formulation shown in Table 5 has been approved for trial production because of its low odor and nonflammable properties. 

The trial vessels contained both embedded and surface breaking flaws in the weld and plate materials. On average, of the 10000 trial vessels... 

Following extensive laboratory trials, four experimental sleeves were first fitted to operational evaporators towards the end of 1980. A further 11 evaporator weld leaks occurred in 1981 and a fUrther 41 sleeves were fitted to by-pass defective and suspect welds. In parallel, work was in progress to examine whether the sleeving technique could be applied on a routine basis. A trial installation of 200 sleeves was conducted on the spare evaporator tube bundle in the latter part of 1982. A decision was then made to sleeve all the 3000 tube-to-tubeplate junctions in the three evaporators. Work on two of the units was completed in 1983 and the third unit was sleeved by March 1984. It was installed in the summer and PFR operated for the first time with three fiilly-sleeved evaporators in August 1984. 

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