Submerged-arc automatic welding method of nuclear power plant steel lining wall plates with ceramic linings

Abstract

The invention provides a submerged-arc automatic welding method of nuclear power plant steel lining wall plates with ceramic linings. The submerged-arc automatic welding method comprises the followingsteps: step 1, carrying out groove processing on steel lining splice plates; step 2, assembling the processed steel lining splice plates in pairs; step 3, mounting arc striking plates; step 4, pasting the ceramic linings; step 5, welding the assembled steel lining splice plates; step 6, dismounting the ceramic linings; and step 7, carrying out non-destructive testing on welds of the welded assembled steel lining splice plates, wherein the steel lining splice plates are mainly adopted as the nuclear power plant steel lining wall plates, nuclear power plant steel lining bottom walls and nuclearpower plant steel lining domes, and the thickness of each steel lining splice plate reaches 6 mm. The submerged-arc automatic welding method provided by the invention has the beneficial effects thatthrough the utilization of the ceramic linings for welding and the reasonable design of welding process parameters, the single-sided welding with double-sided formation during a submerged-arc automatic welding process can be achieved when the steel lining splice plates are shop-fabricated, spliced and welded, the steel lining splice plate turning-over procedure during a conventional double-sided welding process can be avoided, the operation risk can be reduced, and the welding efficiency can be improved.

Description

technical field [0001] The invention belongs to the technical field of construction of nuclear power plant facilities, and in particular relates to an automatic submerged arc welding method for nuclear power plant steel lining wall plates with ceramic liners, which is used for prefabricated welding of nuclear power plant steel linings (including bottom plates, tube wall plates, and dome plates). Background technique [0002] The anti-leakage steel lining of the containment is the third safety barrier of the nuclear island building of the nuclear power plant. The bottom plate, the wall plate and the dome are all important components of the steel lining. The thickness of the steel lining plate is 6mm. As an important component closely related to nuclear safety and nuclear safety level two, nuclear quality assurance level one, its manufacturing, installation accuracy and quality have strict control requirements. The current mature method of workshop prefabrication of steel lini...

AI Technical Summary

Problems solved by technology

However, with the development of the third-generation nuclear power technology, the overall size and weight of the steel lining have increased significantly. The hoisting and turning of large-size and heavy-weight steel lining splicing panels not only has a great safety risk, but also has a great impact on the quality of the steel lining itself. The impact of the 6mm steel lining plate is thin and easily deformed

Therefore, it is no longer possible to turn over, and the submerged arc automatic welding double-sided welding process will be difficult to apply in the workshop

The welding operation in the prefabrication stage of the steel lining splicing panel workshop can only seek the single-side welding and double-side forming process that can be applied to the current situation. At present, there is no application of the single-side welding and double-side forming process in the production stage of the steel lining workshop of nuclear power plants.

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