Hitachi, Ltd.

Munenobu Suzuki

Tomohiko Shida

Tomio Umino

Yuji Sekimura

Shinsui Moroi

Mitho Haginoya

Tomiteru Itoh

Zenshiro Oyama

An apparatus for cutting the leads of an electronic part inserted into a printed board and simultaneously detecting the insertion of said leads and/or the characteristics of said electronic part, said apparatus comprising:

Apparatus for cutting a lead

In a process for fusion-welding a binary combination of an iron alloy containing 50 % by weight or less of nickel and cobalt combined and copper; or a ternary combination of said iron alloy, copper, and iron, including the steps of bringing members of said binary combination or ternary combination into gapless contact with one another and subjecting the contact zone to a treatment including at least one of electron beam welding, laser beam welding, plasma welding, and TIG welding without use of a filler metal, an improvement which is characterized by supplying welding energy necessary to form in the welding zone molten weld metal having such a width and depth that have been determined from the composition and thickness of said base metals so that the composition of the weld metal may fall within the specified area in a diagram, shown in FIG. 1, representing composition of a three component system, said specified area being enclosed with straight lines connecting successively the point X (97 wt-% Cu, 2 wt-% Fe, 1 wt-% Ni + Co), the point Y (2 wt-% Cu, 49 wt-% Fe, 49 wt-% Ni + Co), the point Z (2 wt-% Cu, 97 wt-% Fe, 1 wt-% Ni + Co), and the point X except for the area enclosed with straight lines connecting successively the point a (35 wt-% Cu, 32.5 wt-% Fe, 32.5 wt-% Ni + Co), the point b (10 wt-% Cu, 45 wt-% Fe, 45 wt-% Ni + Co), the point c (8 wt-% Cu, 91 wt-% Fe, 1 wt-% Ni + Co), the point d (45 wt-% Cu, 54 wt-% Fe, 1 wt-% Ni + Co), and the point a. According to this improved process, development of weld cracking can be prevented.

Process for fusion-welding iron-nickle-cobalt alloy and copper or said

A method for welding copper or a copper base alloy and iron or an iron base alloy characterized in that an element for enhancing the mutual miscibility of copper and iron and an element for refining the crystal grains of the weld metal is added to weld metal in a total amount of 1 to 25 percent by weight based on the weld metal, thereby preventing the welded portion from crack formation and segregation.

Welding of copper and iron

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Mito, Japan

Munenobu Suzuki