A self-shielding flux-cored welding wire suitable for underwater welding of high-strength steel
A technology of flux-cored welding wire and self-protection, which is applied in the direction of welding equipment, welding medium, welding/cutting medium/material, etc., can solve the problems of high diffusible hydrogen content, poor toughness, and poor workmanship in weld metal, and achieve toughness and comprehensiveness High performance, solve the poor process, and ensure the effect of weld metal strength
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preparation example Construction
[0034] In the actual preparation process, the amount of each component can be adjusted according to the strength of the welding base material, such as the strength of high-strength steel for marine engineering, to prepare a self-shielding flux-cored wire suitable for the strength of the base material.
[0035] Further, in some embodiments of the present invention, the diameter of the self-shielding flux-cored wire suitable for underwater welding of high-strength steel in marine engineering is 1.2 mm.
[0036] On the other hand, the present invention provides the application of the above-mentioned self-shielding flux-cored welding wire suitable for underwater welding of high-strength steel in marine engineering in underwater welding.
[0037] Further, in some embodiments of the present invention, the base metal to be welded is high-strength steel.
[0038] Furthermore, in some embodiments of the present invention, the base metal to be welded is high-strength marine engineering ...
Embodiment 1-3
[0046] According to the different strengths of marine engineering high-strength steels for underwater welding, self-shielding flux-cored wires suitable for underwater welding of marine engineering high-strength steels provided by Examples 1-3 were prepared according to the ingredients and dosages in Table 1.
[0047] Among them, zinc titanate slag forming agent according to ZnO:TiO 2 =1:1 ratio (mass ratio) prepared by sintering at 1200°C for 2h in a tube atmosphere furnace. The other components were weighed according to Table 1, mixed evenly and added to the welding wire with Cr5 steel strip as the outer sheath according to different filling rates. The finished welding wire of 1.2 mm was used to obtain the self-shielding flux-cored welding wire provided in Examples 1-3.
[0048] Components and mass percentages (%) of the self-shielding flux-cored welding wire provided in Table 1 embodiment 1-3
[0049]
[0050] Table 1 shows the self-shielding flux-cored welding wire use...
experiment example
[0054] The performance test of the self-shielding flux-cored welding wire used for underwater welding of high-strength steel in marine engineering provided by Examples 1-3 was performed using an underwater wet welding test device. The device mainly includes three parts: a pressure chamber, a motion platform and a power source. During the test, the pressure environment at a certain water depth is simulated by injecting water into the hyperbaric chamber and introducing high-pressure gas. The size of the test plate is 300×150×20mm.
[0055] According to the "Materials and Welding Specifications" of China Classification Society, the Y-shaped groove is processed, the arc is directly ignited in water, and the welding method of multi-layer and multi-pass welding is adopted. The impact sample and the tensile sample are taken in turn, the tensile test of the deposited metal is carried out according to GB / T 2652-2008, and the V-notch impact test is carried out according to GB / T 2650-20...
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Abstract
Description
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