[BITList] Submarines

[M.j. Feltham]

What about the Welding Gun ?


Mike
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“It was a test of our entire industry, because every order involves more than 600 companies—an entire industry! Can we make such a complex product? We learned from experience that the situation is not all that bad. All sorts of problems arose in the course of the work and a lot of things had to be refined after testing, but we built our next ship, the Alexander Nevsky, in seven years, and the Vladimir Monomakh in six years,” says Semakov.
From tugs and barges to pontoons and fish factories, in the last couple of decades, Sevmash has built more than 100 ships for Germany, Sweden, Norway and the Netherlands. The development of civil shipbuilding kept Russia’s largest defense shipyard afloat and, in effect, saved it from ruin in the 1990s.
In the coming years, Sevmash’s new nuclear submarine will “test the waters” more often. By 2020, the company plans to build 15 new-generation nuclear submarines — seven Yasens and eight Boreys. “Submarine-building is a business nowadays. Gone are the days when the party leadership handled our production-related issues. Today we need to be able to negotiate both prices and delivery dates. We survive by hook or by crook in difficult market conditions,” says Alexandra Vlasova, head of the company’s testing and measurement group and winner of the national Engineer of the Year 2012 award.

It is difficult to overestimate the degree of responsibility of Vlasova and her team. At the submarine’s operating depth, the stream of water that comes out of the one-centimeter hole in the hull has enough energy to cut a man in half. So it is no small wonder that, when submariners gather around the table on special occasions, the third toast is always: “To the hull. May it stay strong.”

Actually, submarines are not built, but welded. Today’s submarines have millions of welds joining hundreds of thousands of components. The company keeps track of who performed each weld, and this

information is stored for as long as the submarine is in service. While every weld is thoroughly checked by X- ray and ultrasound analysis, the personalization of responsibility for a potential disaster on par with Chernobyl significantly improves the quality of the work. Still, there are places where human welders cannot work. For these places, you need a robot.

Sevmash’s Shipyard 42 built the Leninsky Komsomol, the Soviet Union’s first nuclear submarine, in 1957. It also built the Zolotaya Rybka, the world's first titanium submarine, in 1968; its top speed of 52 miles per hour underwater remains unsurpassed to this day.
Gradually, the function of developing into other areas was assumed by Shipyard 55. In the 1980s, it built the Akula series (project number 941), the largest “steel predators” in the world — two football fields long and as tall as a 9-story building. The Akula is listed in the Guinness Book of Records.

“Here, the welded seam is nearly perfect,” says first-category electrical engineer Sergei Ryzhkov, gravely.
We stumbled upon a small porthole located at the halfway mark of a huge barrel that is four stories high and can hold 237,755 gallons. Behind a thick pane of glass, a huge terminator-like hand hovers over a pile of iron. Instead of a brush, the computerized hand holds an electron-beam gun. The electron beams coming out of the barrel glide over the surface of the metal in a yellow speck, leaving a perfect weld.
“It is remarkable that all of the mechanical equipment was made in Russia. The Progress Research Institute in the city of Izhevsk still produces such things. The gun can do practically any maneuver. It is a unique assembly. Many people know about this and are envious—the Americans, the Japanese and the Germans,” says Ryzhkov.
The near-perfect vacuum in the barrel ensures a far better weld than without it. In this chamber, the welds are made at the nodes responsible for noise dampening.
Stealth is the main weapon of any submarine. It is the entire raison d'etre of the submarine fleet. A submarine that is discovered is as good as destroyed, so the need to keep the noise low is a constant headache for those who design them. The electron-beam welding device largely solves the problem.
The black-as-pitch anti-echo envelope is only the outward aspect of the technological treasures carefully hidden under the high-strength steel hull. It is the know-how that allows Russian submarines to escape detection in the midst of NATO anti-submarine military exercises and sometimes visit the Gulf of Mexico. These submarines have, as it were, keen eyes and sensitive ears, preventing the appearance of and enabling the recognition the enemy at a distance of over 125 miles. And they definitively answer questions that are on the minds of many foreign competitors such as “How is it that Russia’s cruise missiles can fly twice as far as Tomahawks?” Source: Russia beyond the headlines _____________________________________________________________________________________________

   			
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