Double-side friction stir welding method and double-side friction stir welding device for metal sheets or metal plates
a friction stir welding and friction stir technology, which is applied in welding/soldering/cutting articles, non-electric welding apparatuses, manufacturing tools, etc., can solve the problems of increasing the welding speed, the limit to the shape and dimension of metal materials, and the moving speed of the rotating wheel, so as to achieve good welded state, increase the welding speed, and the effect of sufficient strength
Inactive Publication Date: 2020-07-30
JFE STEEL CORP
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Benefits of technology
The present invention provides a friction stir welding method and device that overcomes the problems of the related art. The method involves closely examining the gap between the shoulder parts of a pair of rotating tools facing each other to achieve a sufficient temperature increase and shear stress for welding. By controlling the diameter of the shoulder parts and the thickness of the metal sheets or plates, the method can increase welding speed while suppressing defects and ensuring a good welded state with sufficient strength. The device includes a mechanism for controlling the gap between the shoulder parts of the rotating tools and achieves a homogeneous plastic flow and welding workability improvement. Overall, the invention provides a faster, stronger, and more stable friction stir welding method and device.
Problems solved by technology
However, in this technology, since the metal materials to be joined to each other are rotated, there is a limit to the shapes and dimensions of the metal materials.
However, since problems related to joining workability, such as suppression of occurrence of defects at the time of welding and an increase in welding speed (that is, the moving speed of the rotating tools) still remain, the application of the friction stir welding method to structural steel sheets or structural steel plates is not as widespread as the application of the friction stir welding method to low-melting-point metal sheets or low-melting-point metal plates.
When the technology of the friction stir welding method described in Patent Literature 2 is applied to structural steel sheets or structural steel plates, since the strength of the structural steel sheets or structural steel plates under high temperatures is high, in the case of low-heat input and high welding speed, there is a strong tendency that a state of a sufficient plastic flow described above cannot be realized.
Therefore, it is difficult to increase the welding speed while suppressing defects at the time of welding from occurring.
Method used
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[0087]Using steel sheets or steel plates having the thickness, the chemical composition, and the tensile strength shown in Table 1, friction stir welding was performed. In the case of butt-welding, with joint-butt surfaces not being angled, that is, being in a so-called square-groove milled surface state, the joint-butt surfaces were pushed by rotating tools from both the top-surface side and the bottom-surface side of a butted portion of the steel sheets or steel plates, and were joined to each other. In the case of overlap-welding, two steel sheets or steel plates of the same type were caused to overlap each other and were pushed by the rotating tools from both the top-surface side and the bottom-surface side of an overlapping portion of the steel sheets or the steel plates, and were joined to each other. The welding conditions of the friction stir welding are shown in Table 2. When the facing rotating tools on the respective top-surface side and bottom-surface side were seen from...
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Abstract
Provided is a double-side friction stir welding method of metal sheets or metal plates to each other, and a double-side friction stir device for performing the double-side friction stir welding. According to the present invention, a pair of rotating tools facing each other is respectively arranged on a top-surface side and a bottom-surface side of a butted portion or an overlapping portion, which comprises a joint portion of two metal sheets or two metal plates, the pair of rotating tools is moved in a welding direction while being rotated at the butted portion or the overlapping portion, and while the metal sheets or the metal plates are softened by frictional heat generated between the rotating tools and the metal sheets or the metal plates, softened parts are stirred by the rotating tools to produce a plastic flow to join the metal sheets or the metal plates to each other.
Description
CROSS REFERENCE TO RELATED APPLICATIONS[0001]This is the U.S. National Phase application of PCT / JP2018 / 028516, filed Jul. 31, 2018 which claims priority to Japanese Patent Application No. 2017-148785, filed Aug. 1, 2017, the disclosures of these applications being incorporated herein by reference in their entireties for all purposes.FIELD OF THE INVENTION[0002]The present invention relates to a double-side friction stir welding method of welding metal sheets or metal plates to each other, and to a double-side friction stir welding device for performing double-side friction stir welding. In the friction stir welding method, a pair of rotating tools facing each other is respectively disposed on a top-surface side and a bottom-surface side of a butted portion or an overlapping portion, which becomes a welded joint of the metal sheets or the metal plates; the pair of rotating tools is moved in a welding direction while being rotated at the butted portion or the overlapping portion; and ...
Claims
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IPC IPC(8): B23K20/12
CPCB23K20/126B23K20/1255B23K20/122B23K20/227B23K2101/18B23K2103/04B23K20/1225B23K20/123B23K20/125
Inventor MATSUSHITA, MUNEOIKEDA, RINSEI
Owner JFE STEEL CORP