Vytautas John Jusionis

US Patent:

52889637, Feb 22, 1994

Filed:

Jul 22, 1993

Appl. No.:

8/095906

Inventors:

Vytautas J. Jusionis - Fountain Valley CA

Assignee:

Hobart Brothers Company - Troy OH

International Classification:

B23K 902

US Classification:

219 60A

Abstract:

An orbital welding head for joining two tubes positioned end-to-end includes a welding electrode which is rotated around the tubes and a pair of clamps for holding the tubes in the correct position with respect to each other and the welding electrode. The clamps include a fixed member, a rotatable member and a hinge assembly for joining the rotatable member to the fixed member. The rotatable clamp members are moved clear of the tubes when the tubes are either inserted into or removed from the welding head. Fluid channels are formed in both the fixed and rotatable clamp members. The hinge assembly connects the rotatable clamp member with the fixed member. Fluid channels within the hinge assembly allows cooling fluid introduced into the fixed member to be carried through that member into the rotatable member, cooling both. A return fluid channel is also provided by the hinge. The hinge is provided with a passageway for transferring cooling fluid from one rotatable clamp member to another.

US Patent:

53109821, May 10, 1994

Filed:

Apr 26, 1993

Appl. No.:

8/053097

Inventors:

Vytautas J. Jusionis - Fountain Valley CA

Assignee:

Hobart Brothers Company - Troy OH

International Classification:

B23K 912

US Classification:

219 61

Abstract:

A method and apparatus for welding a branch tube to a header tube includes a fixture having a pair of clamps for supporting the fixture on the header tube. A welding head on the fixture includes a clamp to hold the branch tube in place relative to the header tube. The welding head also includes a collet extending into contact with the header tube. The header tube, the collet and the welding head form a limited volume chamber that contains shielding gas in the vicinity of the joint between the branch tube and the header tube. The welding head includes a mechanism for rotating a tungsten welding electrode around the intersection of the branch tube and the header tube to form the welded joint.

US Patent:

52218180, Jun 22, 1993

Filed:

Sep 27, 1991

Appl. No.:

7/766584

Inventors:

Vytautas J. Jusionis - Fountain Valley CA
William H. Fisher - Troy OH
Randall T. Hensley - Cincinnati OH

Assignee:

Hobart Brothers Company - Troy OH

International Classification:

B23K 900

US Classification:

219 61

Abstract:

A method and apparatus for welding tubes to a tube sheet uses a gas tungsten arc welding (GTAW) torch assembly that is small enough to be inserted through small access holes in a box header. The welding torch is carried near the end of a rotating mandrel that is supported for rotation within a stationary tube. A centering mechanism is inserted into the tube to ensure proper radial alignment of the welding torch with respect to the tube. At the other end of the mandrel is a mechanism for rotating the mandrel and for supplying electrical power, shielding gas and cooling water to the torch and wire to the weld. Axial spacing of the welding torch is provided by a tube stop device that temporarily engages the end of the tube in combination with an axial adjustment device. Once the mandrel is inserted into the tube to be welded, the adjustment device is brought into engagement with the header box wall, a stop lock collar is locked in place, and an adjustment ring is turned a specified amount to move the torch and the stop device axially away from the end of the tube. The torch is then energized and rotated about the joint to weld the tube to the tube sheet.

US Patent:

43651321, Dec 21, 1982

Filed:

Oct 2, 1978

Appl. No.:

5/947357

Inventors:

Gasparas Kazlauskas - Los Angeles CA
Vytautas J. Jusionis - Westminster CA
Max M. Westerberg - Tarzana CA
John W. Meacham - Pasadena CA

International Classification:

B23K 9225
B23K 902
B23K 912
B23K 3702

US Classification:

219 60A

Abstract:

A welding apparatus which is designed to weld together tubular members having any exterior configuration. The welding electrode is mounted on mounting structure which in turn is movably mounted upon the periphery of a housing. The workpiece to be welded is fixedly secured and centrally disposed within the housing. The welding head is to move about the workpiece and also tilt in respect thereto to maintain the longitudinal center axis of the welding electrode continuously perpendicular to the workpiece surface. Step motors are employed to both drive the welding head about the workpiece and also tilt the welding head with respect to the workpiece. The particular exterior configuration of the workpiece has been preprogramed into a memory unit. The memory unit operates through an electronic circuit to operate the step motors to locate the welding head at the precise desired location along the entire length of the welding path.

US Patent:

52201449, Jun 15, 1993

Filed:

Mar 23, 1992

Appl. No.:

7/856111

Inventors:

Vytautas J. Jusionis - Fountain Valley CA

Assignee:

Hobart Brothers Company - Troy OH

International Classification:

B23K 912

US Classification:

219 60A

Abstract:

A water cooled orbital welding apparatus permits continuous welding of pipes and tubes in a limited space by including a liquid cooled plate inside a head assembly to remove heat from the gear carrying the welding electrode around the tubes being welded. A plurality of spring loaded ball bearings maintain the rotating gear in tight contact with the cooling plate. By keeping the gear and electrode cool, thermal expansion of the internal components of the welding head is minimized. Since thermal expansion is not a major factor, noncompatible materials in terms of thermal expansion characteristics may be used in the construction of the device. A removable cassette of symmetrical design allows a cassette to be mounted on the head from either the right or from the left, thus allowing the operator to open the clamps on the cassette from either the front side or the back side of the weld head. An offset hinge on the cassette permits the cassette to be removed from the welded tubes in confined space. The cassette is provided with a colored glass window to permit viewing of the welding operation.