アール形状

US8872060(SHAPE CORP [US])
[0025] Notably, the welding box fixture assists with setting the line contact and with setting a desired abutting pressure for the welding process at the line contact. The mating materials are held abuttingly against each other by the weld fixture shown in FIG. 8, as discussed below, to facilitate a good weld. A radiused shape of the edges allows good contact, yet allows the edges to flex, slide, and bend (caused by forces generated in the weld box fixture), especially along slip plans P 1 and P 2 , allowing the fixture to “set” and maintain a desired cross sectional shape in the weld station. This arrangement facilitates good welding, and potentially decreases the criticality of perfect dimensionality of the edges. Concurrently, the edges of the sheet include a tip section of material inside the beam that extends away from the weld line. As noted above, the free end of the tip section is necessary to assure that there is sufficient material to weld despite material variations along the edge and process variations. 

US8984880(HONEYWELL INT INC [US])
[0052] In the group 1210 , a plug 1212 includes a conical shape and a seat 1214 includes a corner shape 1214 , a radiused shape 1216 (e.g., a portion of a toroidal surface) or an elliptical shape (e.g., a portion of an elliptical surface).