Lee H Flasche

48160857, Mar 28, 1989

Aug 14, 1987

7/085119

Lee H. Flasche - Kokomo IN
Narasi Sridhar - Carmel IN

Haynes International, Inc. - Kokomo IN

C22C 3842

148327

Disclosed is a duplex stainless steel containing about 25% chromium, about 2% copper, about 3% molybdenum, about 0. 2% nitrogen, about 9% nickel and the balance iron plus modifying elements and impurities. In corrosion conditions, including severe pitting environments, the steel contains up to 3%, and preferably 0. 2 to 1. 0% niobium. The alloy is especially suited for use as a welding filler material. The steel, after welding, has improved Charpy impact properties, increased tensile ductility and corrosion resistance. The steel is also suited for use in the form of cast, wrought or powder products.

49162810, Apr 10, 1990

Feb 23, 1989

7/313824

Lee M. Flasche - Kokomo IN
Gregory L. Hoback - Greentown IN
James L. Meyers - Kokomo IN

Haynes International, Inc. - Kokomo IN

B23K 916

219 61

Disclosed is an improvement in the process of gas back-purging the root section of the weld during open-butt welding of pipe. The rates of gas flow in back-purging and in torch shielding are controlled and a ratio between the flow rates is established. The invention teaches a gas back-purging flow rate of about 40 CFH and a torch shielding flow rate of about 10 CFH under typical conditions to maintain a required 4 to 1 ratio of the flow rates.