Fusion zone purification by controlled laser welding

Details Fusion zone purification by controlled laser welding Fusion zone purification by controlled laser welding

1975-12-09

1976-12-28

Reynolds, Bruce A.

Electric heating

Metal heating

By arc

B23K 2700

Patent

active

040003922

ABSTRACT:
A method of accomplishing a controlled weld with a beam of laser radiation is disclosed. The workpiece is cleaned and fitted prior to joining and a flow of a gas is provided in the weld region to prevent the formation of radiation insulating plasma between the laser source and the workpiece and to aspirate gaseous impurities from the weld zone. In addition, a trailing cover gas is provided to both the top and the bottom of the weld until the joint is sufficiently cooled to prevent reaction between the metal and the atmosphere. The beam must contain more than two kilowatts of power and be focusable on the workpiece to a power density of at least one megawatt per square inch in order to produce a keyhole in the fusion zone. Further, a weld speed in excess of twenty inches per minute and a progressive solidification technique of the weld contribute to the expulsion of contaminants from the weld.

REFERENCES:
patent: 3535489 (1970-10-01), Hinrichs
patent: 3824368 (1974-07-01), Locke
patent: 3860784 (1975-01-01), Brown et al.
"Welding for Engineers" by Udin et al., John Wiley & Sons, Inc. New York pp. 10-13.
"Understanding the Role of Inclusions and Microstructure in Ductile Fracture" by Hill et al., Welding Research Supp. pp. 481s-485s, 11-1974.
"Welding With a High-Power CO.sub.2 Laser" by Ball et al. Society of Automotive Engineers, Paper 740863, Oct. 1974.
"Welding Metallurgy Carbon and Alloy Steels" by Linnert, American Welding Society, p. 59 & pp. 224-225 & pp. 250-255, 3rd Ed. vol. 2.
"The New Development of Steel Weldments" by Gross, Welding Research Supp., June 1968, pp. 241s-245s.

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