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A pulp screening assembly where each support ring is weldlessly bonded to a perforate screen section by a bonding material that preferably is a brazing material. There is a joint between each ring and a screen section in which brazing material is disposed. The joint includes at least one set of mati

A pulp screening assembly where each support ring is weldlessly bonded to a perforate screen section by a bonding material that preferably is a brazing material. There is a joint between each ring and a screen section in which brazing material is disposed. The joint includes at least one set of mating faying surfaces that are offset relative to a longitudinal axis of the screening assembly. In a preferred embodiment, there is a tolerance between mated faying surfaces of no greater than 0.008 inches to ensure a good weldless bond is achieved. In another preferred embodiment, the tolerance is no greater than 0.004 inches. A weldless screen basket is produced having end rings, a plurality of slotted screen sections, and an intermediate ring having slots with back grooves within four millimeters of a ring at each end increasing screening open area.

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1. A screen basket for a pulp screening apparatus comprising:a plurality of perforate cylindrical screen sections disposed along a common longitudinal axis, the plurality of screen sections each formed of a cylindrical plate having a pair of axial edges and a plurality of parallel screening slots fo

1. A screen basket for a pulp screening apparatus comprising:a plurality of perforate cylindrical screen sections disposed along a common longitudinal axis, the plurality of screen sections each formed of a cylindrical plate having a pair of axial edges and a plurality of parallel screening slots formed therein; a pair of annular end support rings with (a) one of the end support rings engaging an axial edge of one of the plurality of screen sections forming a first tongue and groove joint therebetween that has a bonding material disposed therein that weldlessly bonds the one of the end support rings to the one of the plurality of screen sections, and (b) the other one of the end support rings engaging an axial edge of another one of the plurality of screen sections forming a second tongue and groove joint therebetween that has a bonding material disposed therein that weldlessly bonds the other one of the end support rings to another one of the plurality of screen sections; an annular intermediate support ring that is disposed between a plurality of the screen sections forming a third tongue and groove joint formed between the intermediate support ring and one of the screen sections that has a bonding material disposed therein that weldlessly bonds the intermediate support ring to the one of the screen sections and a fourth tongue and groove joint formed between the intermediate support ring and another one of the screen sections that has a bonding material disposed therein that weldlessly bonds the intermediate support ring to the another one of the screen sections; wherein a plurality of the screening slots each include a back groove that has each one of its ends disposed within four millimeters of a support ring.