Patent ID: 7550693

Claim:
A hand-held laser fusion welding assembly adapted to couple to a laser delivery system, a gas supply system, and a liquid coolant supply system, the assembly comprising: a nozzle having an aperture through which laser light from the laser delivery system and gas from the gas delivery system passes; a main body dimensioned to be grasped by a hand and adapted to couple to the laser delivery system, the gas supply system, and the liquid coolant supply system, the main body having a first end and a second end, the main body first end coupled to the nozzle, the main body including: a gas flow passage extending through the main body, the gas flow passage including a gas inlet port formed in the main body second end, and a gas outlet port formed in the main body first end and in fluid communication with the nozzle aperture; a plurality of liquid coolant inlet flow passages formed in the main body, each liquid coolant inlet flow passage having a liquid coolant inlet port formed in the main body second end and extending, from the main body second end, at least partially into the main body toward the main body first end, to a fixedly sealed end; a plurality of liquid coolant outlet flow passages formed in the main body, each liquid coolant outlet flow passage having a liquid coolant outlet port formed in the main body second end and extending, from the main body second end, at least partially into the main body toward the main body first end, to a fixedly sealed end; and a plurality of fixedly sealed crossover channels formed within the main body that couples the ends of pairs of the liquid coolant inlet and liquid coolant outlet flow passages in fluid communication with one another.