A combined weld seam of weathering steel and its welding method

Abstract

The invention discloses a combined weld seam of weathering steel and a welding method thereof, which comprises an inner filling layer and an outer covering layer and / or sealing layer; the welding material of the filling layer is low alloy steel, and the covering layer And / or the welding material of the sealing layer is stainless steel. The welding seam adopts low-alloy steel and stainless steel combined welding seam, the low-alloy steel filling layer inside has excellent mechanical properties, and the stainless steel cover layer (sealing bottom layer) outside has good corrosion resistance, which can make the welded joint both It has good mechanical properties and corrosion resistance, and the cost will not increase significantly. This weld can solve the problem that the corrosion resistance of the weathering steel weld does not match the base metal without significantly increasing the cost, ensuring that the weld has mechanical properties matching the base metal and better corrosion resistance than the base metal, avoiding Welds become a corrosion-resistant performance short-board to improve the overall life of the building.

Description

technical field [0001] The invention belongs to the field of welding, in particular to a combined weld seam of weathering steel and a welding method thereof. Background technique [0002] In recent years, the country has vigorously advocated prefabricated buildings. Compared with existing reinforced concrete buildings, steel-structured prefabricated buildings have the advantages of light weight, fast construction period, and environmental friendliness. in reinforced concrete buildings. Applying high-strength weathering steel to prefabricated buildings can make the prefabricated buildings have a longer life, and take advantage of the green and environmental protection of prefabricated buildings, which can further reduce costs in the long run. [0003] For the welding of weather-resistant steel for prefabricated buildings, ensuring the weather resistance of the weld area is the key and also the difficulty. If the weld area cannot achieve the same weather resistance as the ba...

AI Technical Summary

Problems solved by technology

If the weld area does not achieve the same weather resistance as the base metal, corrosion will first occur at the weld and affect the overall service life of the building, making it impossible to bring out the advantages of weather-resistant steel

At present, the commonly used method is to select a welding wire with a weather resistance coefficient similar to or higher than that of the base metal of weather resistance steel for welding of weather resistance steel, and there will be ablation of elements during the welding process, and there will be a certain stress in the weld area, even if the weather resistance steel is selected It is also difficult to guarantee the weather resistance of welding seams with better welding consumables

The corrosion resistance of stainless steel is far superior to weathering steel, but the cost of stainless steel welding consumables is relatively high. If used in large quantities, the cost will increase. At the same time, stainless steel and weathering steel have great differences in composition and structure, and the mechanical properties of joints are difficult to guarantee.

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