Flux cored arc weld metal joint having superior CTOD in low temperature and steel member having the weld metal joint
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A flux-cored wire and arc welding technology, applied in arc welding equipment, welding medium, welding equipment, etc., can solve the problem of difficult to ensure CTOD performance of metal welding, and achieve the effect of excellent CTOD performance and high strength performance
Active Publication Date: 2013-03-06
浦项股份有限公司
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Therefore, it is difficult to ensure the CTOD performance of metal welding
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[0102] Hereinafter, the present invention will be described in detail through the embodiments of the present invention.
[0103] Welded metal joints with the composition shown in Tables 1 and 2 were manufactured through FCAW with a welding heat input of 7-30kJ / cm or higher.
[0104] The test piece was cut from the middle part of the welded metal joint and subjected to tensile test and CTOD test. The results are shown in Table 3.
[0105] A specimen No. 4 according to KS B 0801 was used as a specimen for the tensile test, which was performed at a slide speed of 10 mm / min.
[0106] The CTOD specimen is manufactured according to the BS7448-1 specification, and the fatigue crack is located in the middle of the SAW welded metal joint.
[0107] An image analyzer and an electron microscope are used to measure the size, number and spacing of oxides that have an important influence on the CTOD performance of welded metal joints according to the point counting method. The results are shown in Ta...
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Abstract
The present invention relates to a weld metal joint subjected to flux cored arc welding (FCAW) used for weld structures, such as ships, buildings, bridges, marine structures, steel pipes, and line pipes, and a steel member having the weld metal joint, and more particularly, to a flux cored arc weld (FCAW) metal joint having excellent CTOD properties at low temperature and a steel member having the FCAW metal joint. A flux cored arc weld metal joint having excellent CTOD properties at low temperature may include, by weight: 0.01 to 0.2% C, 0.1 to 0.5% Si, 1.0 to 3.0% Mn, 0.5 to 3.0% Ni, 0.01 to 0.1% Ti, 0.0010 to 0.01% B, 0.005 to 0.05% Al, 0.003 to 0.006% N, at most 0.03% P, at most 0.03% S, 0.03 to 0.07% O, the FCAW metal joint satisfying a relation of 0.7=Ti / O=1.3, 6=Ti / N=12, 7=O / B=12, and 1.2=(Ti+4B) / O=1.9, and the balance of Fe and unavoidable impurities, the FCAW metal joint including a microstructure having acicular ferrite of 85% or more and at least one of the balance of bainite, grain boundary ferrite, and polygonal ferrite. A steel member includes the metal weld joint. According to the invention, there is provided a flux cored arc weld metal joint having a high- strength property and CTOD properties at low temperatures and a steel member having the metal weld joint.
Description
Technical field [0001] The present invention relates to welded metal joints for flux-cored wire arc welding (FCAW) for welding structures such as ships, buildings, bridges, offshore constructions, steel pipes, and pipelines, and steel members having the welded metal joints, more specifically , It relates to a flux-cored wire arc welding (FCAW) metal joint with excellent CTOD performance at low temperatures and a steel member with the FCAW metal joint. Background technique [0002] Recently, due to the continuous increase in oil prices, more and more offshore structures have been constructed and used in cold regions. The steel components used require high strength and high CTOD performance at low temperatures. [0003] The CTOD performance of welded joints in offshore construction is an extremely important factor to ensure the stability of offshore construction. [0004] Generally, flux-cored wire arc welding on offshore structures uses a heat input range of about 7-25kJ / cm. [0005]...
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