A Spraying Protection Process for Girth Welding Welding Seam of Stainless Steel Water Tank Liner

Abstract

The invention discloses a girth weld spraying protection process for an inner container of a stainless steel water tank. The process comprises the following steps: (1) the inner container welded with seal heads is put into an auxiliary device, and fixed on the auxiliary device in such a manner that a driving rotary disc and a driven rotary disc are matched with technological holes in the seal heads; (2) the driving mechanism is turned on, a moving part driven by the driving mechanism is raised, and thus a spray nozzle can be aligned with an assembly crack formed after the cylinder body of the inner container and the seal heads are assembled and welded together; and (3) a motor is turned on and drives the driving rotary disc to rotate, the inner container rotates along with the driving rotary disc, a valve on a high-pressure glue conveying pipe is opened for pressure boosting, and high-temperature glue enters the nozzle through the high-pressure glue conveying pipe; along with rotation of the inner container, the high-temperature glue is sprayed in the high-pressure state into the assembly crack formed after the cylinder body of the inner container and the seal heads are assembled and welded together; along with an increment in the number of turns, the assembly crack is fully filled with the high-temperature glue to form a dense protection layer, thereby isolating the contact between water and a weld.

Description

technical field [0001] The invention relates to the technology in the field of water tank production, in particular to a process for spraying and protecting weld seams of girth welding of inner tanks of stainless steel water tanks. Background technique [0002] At present, the inner liner material of air energy, solar energy, and floor heating water tanks is basically SUS304-2B, and the inner liner and the head are argon arc welded; during the welding process, especially the metal in the welding heat-affected zone is sensitized at 500-800 °C When the temperature is high, the diffusion of supersaturated solid-solution carbon to the grain boundary is faster than that of chromium. Because its C content is >0.03%, it promotes the combination of chromium and carbon near the grain boundary to form (Cr, Fe)25C6 carbide , so that the chromium content near the grain boundary decreases. Since the diffusion rate of chromium in steel is very slow, it is difficult to supplement the c...

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Problems solved by technology

[0003] In view of this, the present invention aims at the deficiencies in the prior art, and its main purpose is to provide a welding seam spray protection process for stainless steel water tank liner girth welding, which can effectively solve the problem that the existing water tank liner weld seam is exposed to heat for a long time. Corrosion prone to leakage in water

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