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Traceless laser correction method for back deformation of stainless steel plate subjected to non-penetration laser welding

InactiveCN102151988ARestore levelRealization of deformation correctionLaser beam welding apparatusSteel platesHeating time
The invention discloses a traceless laser correction method for back deformation of a stainless steel plate subjected to non-penetration laser welding and belongs to the technical field of laser heat treatment. Abrasive machining is performed on the back of an external plate before or after non-penetration laser welding in the prior art to form surface wire drawing lines, so the deformation of the back of the external plate can be covered visually; by the prior art, the deformation cannot be corrected sensibly; the wire drawing lines cannot cover the welding deformation in different directions; the covering and the welding deformation in the same direction only become unclear visually. In the traceless laser correction method, laser is used as a heat source to movably heat a deformed region of the back of the external plate of a stainless steel railway vehicle body along the direction of a welding line; meanwhile, a protective gas is blown into the heated region; the mobile heating time is greater than or equal to one; and the moving direction of the heat source for each time of heating is the same. By the traceless laser correction method, traceless correction for the back deformation of the stainless steel plate of the railway vehicle subjected to non-penetration laser welding can be realized.
Owner:CHANGCHUN UNIV OF SCI & TECH

Adjustable well lid with outer portion being square and inner portion being round and mounting and adjusting method of adjustable well lid

The invention relates to an adjustable well lid with the outer portion being square and the inner portion being round and a mounting and adjusting method of the adjustable well lid. The adjustable well lid comprises a well lid body with the outer portion being square and the inner portion being round on the upper portion, independent load bearing modules on the lower portion and adjusting bolts connected and supported between the well lid body with the outer portion being square and the inner portion being round on the upper portion and the independent load bearing modules. The number of the independent load bearing modules is four, and load bearing portions are located on a roadbase. Each adjusting bolt is composed of a bolt rod on the lower portion, an integrated nut in the middle and anunthreaded rod on the upper portion. The bolt rods are in threaded connection with reserved screw holes in the load bearing modules. The diameter of each integrated nut is larger than the aperture ofa corresponding reserved through hole in the well lid body, so that the well lid body with the outer portion being square and the inner portion being round on the upper portion is flushed with the roadbase. The unthreaded rods penetrate through the reserved through holes of the well lid body with the outer portion being square and the inner portion being round, and a clamping opening is formed inthe end face of each unthreaded rod. According to the adjustable well lid, various possibilities that problems appear in the stages of construction, use and maintenance are avoided, meanwhile, operation is convenient and economical, and daily roads are safe to use and comfortable.
Owner:CHINA UNIV OF MINING & TECH
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