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The three geometries studied were butt-welds; T-welds with the lower melting PA 6 on the web, denoted as the TW series; and T-welds with PA 6 on the flange, denoted as the TF series.
The meltdown-time profiles for PA 6 to PA 66 butt-welds exhibit the classic four meltdown phases observed in welds of similar polymers.
4 are comparable meltdown-time profiles of butt-welded PA 6-PA 6 and PA 66-PA 66 plates (18).
Butt-welds: [[sigma].sub.butt] = 54.3 + 16.4 M - 21.6 P + 3.1 [P.sup.2] (1)
The maximum strength observed for dissimilar PA 6-PA 66 butt-welds was 66 MPa.
The TF-weld strengths were consistently lower than those of the butt-welds. In general, lower T-weld strength has been attributed to stress concentrations at the corner in the web-flange joint (9-11).
The traditional methods used for joining composite pipe are the adhesive bonded joint and the butt-weld joint.
The average maximum bending moment was found to be 6500 N-m, 37% less than that achieved using the current butt-weld method.
The increased strength over the butt-weld method is due primarily to both the resin and multi-directional glass fiber fabric.
An overall increase of 28% and 29%, respectively, over the currently used butt-weld joining method was achieved.
The overall conclusion of this study is that this new heat-activated joining technology may be a feasible substitute for the currently used butt-weld joining method, effectively offering the necessary strength and ease of installation.
Stress concentration factors [k.sub.m] [??] [[sigma].sub.hs]/[[sigma].sub.hs,0] and [[sigma].sub.en]/[[sigma].sub.en,0] for increasing relative misalignment e/t and for the hotspot stress and effective notch stress methods, respectively: a) structural (hot-spot) stress concentration factor for butt-welded Y-joints; b) effective notch stress concentration factor for butt-welded Y-joints; c) effective notch stress concentration factor for butt-welded X-joints
After blanking, the blank is rolled into a circle, and the two ends are flash butt-welded. The rim is spun in a CNC-controlled flow-forming operation to create the basic shape.
Each is butt-welded to the mating string and the welds covered with a heat-shrinking protective sleeve.
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