Butt welding method of steel plate and butt welding joint of steel plate
A technology for butt welding joints and steel plates, used in welding equipment, laser welding equipment, arc welding equipment, etc., can solve the problems of toughness deterioration, lack of regulations, welding metal hardening, etc., to reduce heat input, suppress deformation, and improve toughness. Effect
Active Publication Date: 2019-03-05
JFE STEEL CORP
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Problems solved by technology
However, this technology has the following problem: In order to keep the Ceq value of the weld metal in an appropriate range, it is necessary to adjust the content of elements added to the steel plate, and when this technology is applied to steel plates for general welded structures, it is not always possible to improve the weld metal. The effect of toughness
However, this technique has the following problems: In order to keep the Ceq value of the steel plate in an appropriate range, the content of various elements must be adjusted, and when this technique is applied to steel plates for general welded structures, the effect of improving the toughness of the weld metal may not be obtained.
However, in this technology, the weld metal composition formed by gas shielded arc welding and laser welding is not specified, so there is a problem that hardening of the weld metal, that is, deterioration of toughness is likely to occur.
Method used
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[0053] Two steel plates 1 (thickness t: 12 mm, 24 mm, 36 mm) of the composition shown in Table 1 are butted together to form figure 1 Y-groove shown. Groove depth h and groove angle θ are shown in Table 2. In addition, Ceq is calculated according to the following formula.
[0054] Ceq=[%C]+[%Mn] / 6+[%Si] / 24
[0055] Here, [%C], [%Mn], and [%Si] are the contents of C, Mn, and Si in the steel, respectively.
[0056] [Table 1]
[0057] Table 1
[0058] C
Si
mn
P
S
Ti
Al
N
O
Ceq
0.06
0.15
1.55
0.005
0.001
0.01
0.02
0.0045
0.0025
0.32
[0059] The unit is mass %
[0060] Then, the opening part 2 positioned at the upper part of the Y-groove was joined by submerged arc welding (single pass). In order to ensure the amount of deposition, submerged arc welding is performed with two electrodes. Its setting conditions are shown in Table 2. In addition, the Ti content, B content, and Al content of the wire...
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The butt welding method of steel plates of the present invention is to butt two steel plates (1) to form a Y-shaped groove having an opening (2) in the upper part and a blunt edge part (3) in the lower part. The opening (2) is joined by submerged arc welding to form a submerged arc welding metal (4) containing 0.030 to 0.100 mass% of Ti, 0.0030 to 0.0080 mass% of B, and Al When the content (mass%) is [%Al] and the O content (mass%) is [%O], [%Al] / [%O] is in the range of 0.5 to 1.2. Next, the above Y-shaped The blunt edge portion (3) of the groove is joined by laser welding to form the laser welded metal (5) so as to penetrate into the submerged arc welded metal (4).
Description
technical field [0001] The present invention relates to a butt welding method of a steel plate and a butt welded joint of a steel plate, and more specifically, to a butt welding method capable of obtaining a weld metal having excellent toughness by using submerged arc welding and laser welding, and to butt welding of a steel plate obtained by the method head. Background technique [0002] Since laser welding has a high energy density, it is attracting attention as an efficient welding technique with high welding speed and deep penetration. Furthermore, since the influence of heat by welding is small, there is also an advantage of being able to form a welded joint that suppresses deformation and deformation due to heat. [0003] However, laser welding has a smaller heat input than other welding methods (for example, arc welding, etc.), so the cooling rate after welding becomes faster. As a result, the weld metal hardens and toughness deteriorates. Therefore, research has be...
Claims
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IPC IPC(8): B23K28/02B23K9/18B23K26/21C22C38/14C22C38/06
CPCB23K9/18B23K28/02C22C38/00C22C38/14B23K26/21B23K26/348B23K9/23B23K33/00
Inventor 上月涉平早川直哉大井健次
Owner JFE STEEL CORP