Abstract: In order to provide an automatic figure drawing apparatus in which erroneous figure drawing can be prevented, neither a large-capacity magnetic disk nor a number of floppy disks is required, and management and operation can be performed easily by integrating a parametric system storing various CAD (Computer Aided Drafting) figures and an inventory control system. An automatic figure drawing apparatus provides a data selection device for selecting figure drawing data of an figure, on the basis of assignment data, from memory in which a data base of various dimensions of predetermined figure drawing subjects is built, and a figure drawing information production device for supplying figure drawing information of a parametric system to a figure drawing output device on the basis of the selected figure drawing data. Thereby, it is possible to prevent mistakes from being produced by a user selecting catalog data in a book.

Abstract: A method of welding metal products, at least one of which is made of nickel or a nickel alloy, comprises the steps of generating an arc between the products to be welded, serving as a positive pole, and a tungsten electrode held by a welding torch, serving as a negative pole. A shielding gas is emitted, consisting of an argon-based mixed gas containing one or both of hydrogen and helium, from a confining gas nozzle concentric with the tungsten electrode, thus confining the apparent flaring angle of the arc within 80 degrees. The welding torch is moved along the weld line while feeding the tip of a filler wire to a part of the molten pool directly below the arc. This method is applicable to the welding of metal products, at least one of which is made of nickel or a nickel alloy.