Protecting device of welding seam of titanium-steel composite plate of sleeve-type chimney and use method of protecting device

Abstract

The invention discloses a protecting device of a welding seam of a titanium-steel composite plate of a sleeve-type chimney and a use method of the protecting device. After the titanium-steel composite plate of a smoke exhaust inner barrel of the sleeve-type chimney is subjected to edge rolling forming and is assembled, and before the titanium-steel composite plate is butted with a V-shaped welding seam, the protecting device is manufactured on a welding seam titanium plate surface by adopting galvanization C-shaped steel, and when a steel plate sealing welding seam of the titanium-steel composite plate is welded, the C-shaped steel of the protecting device is attracted to the titanium-steel composite plate by using a mightiness magnet on the welding seam titanium plate surface; when a steel plate back surface of the titanium-steel composite plate is subjected to back gouging, a thin steel plate at an opening of the C-shaped steel is removed, and the steel plate sealing welding seam can be subjected to the back gouging by using carbon arc air gouging along a strip-shaped notch. Since space between the C-shaped steel and the welding seam titanium plate surface is filled with a rock wool material, when the steel plate sealing welding seam and the steel plate back surface are subjected to the back gouging and the welding, pollutants like welding slag, splashes and smoke are not in contact with the titanium plate, and the disadvantages that weld cracks are generated and the corrosion resistance is lowered due to the fact that titanium steel interfusion occurs or titanium steel is polluted by iron during the welding can be avoided. The protecting device is simple in structure and easy to use, the construction quality is improved and the construction efficiency is improved.

Description

technical field [0001] The invention relates to a building construction auxiliary device and a use method, more specifically, to a sleeve type chimney titanium-steel composite plate welding seam protection device and a use method. Background technique [0002] The chimneys of thermal power plants generally adopt the sleeve chimney structure, that is, the load-bearing concrete outer cylinder and the smoke exhaust inner cylinder are separated, so that the stressed structure of the concrete outer cylinder is not in contact with the strong corrosive flue gas, and the smoke exhaust inner cylinder It is made of titanium-steel composite panels with good impermeability and airtightness, strong integrity and light weight. Titanium-steel composite panels have the combined properties of structural high-strength steel and corrosion-resistant titanium, and are an ideal anti-corrosion treatment material. In the welding construction of titanium-steel clad plate in the smoke exhaust inner t...

AI Technical Summary

Problems solved by technology

In the welding construction of titanium-steel clad plate in the smoke exhaust inner cylinder of the sleeve type chimney, the weld groove generally adopts the butt joint form, the weld grade is first grade or not lower than second grade, and the special feature of welding is that titanium and steel cannot be melted. Welding, once the titanium weld is polluted or interfused with steel, it will become brittle locally and cracks will appear in the weld; at the same time, the titanium weld containing iron or contaminated by iron ions will have a low electrode potential of the precipitated iron titanium oxide, which will greatly reduce the titanium alloy. Material corrosion resistance

However, the weld seam of titanium steel composite plate is so close, it is difficult to ensure that the manual welding of the long continuous butt weld seam of steel plate and titanium plate will not cause mutual melting of titanium steel or contamination by iron

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