Vertical Narrow Groove Gas Shielded Arc Welding Method
A technology of narrow groove and arc protection, applied in arc welding equipment, welding equipment, welding medium, etc., can solve the problems of difficulty, complicated welding equipment, large thermal influence of steel plate, etc., to achieve less deposition and restrain welding heat Input, the effect of reducing welding construction cost
Active Publication Date: 2021-09-07
JFE STEEL CORP
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Problems solved by technology
However, the amount of heat input greatly increases to about 360kJ / cm due to bipolar polarization, so the thermal influence on the steel plate becomes larger. When high characteristics (strength, toughness) are required for the joint, it is necessary to satisfy such characteristics very difficult
[0019] In addition, in this two-electrode gas shielded arc welding device, it is essential to provide a ceramic backing plate on the back side of the groove and a water-cooled copper substrate pressing mechanism on the surface (welding machine side). , although there is no worry about dripping of molten metal, but the welding device becomes complicated
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[0123] Under the welding conditions shown in Table 2, use image 3 The welding torch (θ3: 15 °, L: 20 mm) having a curved portion is shown in the supply welding nozzle, and two steels that become the shape of the groove shape shown in Table 1 have a narrow slope vertical-type gas protection arc. weld.
[0124] Here, the steel has a steel containing C: 0.04 ~ 0.28% by mass, Si: 0.1 ~ 0.2% by mass, Mn: 1.8 ~ 2.0% by mass, P: 0.01% by mass, S: 0.005% by mass or less, Al: 0.02 ~ 0.06 Quality %, O: 0.003% by mass or less and N: 0.005% by mass or less and the remainder is a steel material of FE and inevitable impurities. In addition, gas cut is used in the groove processing of steel, and the slope surface is not grinded.
[0125] Further, the welding wire uses the steel strength or a solid wire of 1.2 mmφ than the level of 1 level. Further, the composition ingredients of the wire other than the REM shown in Table 2 have C: 0.10 to 0.20% by mass, Si: 0.6 ~ 0.8% by mass, Mn: 1.8 ~ 2.0% by ...
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Abstract
The invention provides a vertical narrow groove gas shielded arc welding method. In the vertical narrow-groove gas-shielded arc welding method of joining two thick steel materials with a plate thickness of 10mm or more by using swing single-layer welding or multi-layer welding as predetermined groove conditions, REM containing a predetermined amount is used Welding wire, and using a welding torch with a curved part and a front end divided by the curved part, perform the swing of the first layer welding. The front end of the torch is swung toward the beveled face of the thick steel.
Description
Technical field [0001] The present invention relates to a narrow-groove gas shielded arc welding method, particularly relates to a vertical narrow-groove gas shielded arc welding method can be applied to the butt welding of steel Hou 2. [0002] Here, the "narrow groove" means a groove angle is 20 ° or less and the groove gap is 20mm or less. Background technique [0003] Gas shielded arc welding of steel for the construction is usually a separate CO 2 Gas, or CO and Ar 2 Gas mixture for protection of the consumable electrode melting portion. Such gas shielded arc welding is widely used in manufacturing automobiles, buildings, bridges and electrical equipment and the like. [0004] However, in recent years, along with the size of the thick-walled, the process of making the welded steel structure / , in particular, the amount of welding butt welding steel material is increased, and thus the welded construction requires more time, resulting in construction cost increases. [0005] A...
Claims
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IPC IPC(8): B23K9/173B23K9/02B23K9/022B23K9/12B23K35/30C22C38/00C22C38/06
CPCB23K9/02B23K9/022B23K9/12B23K9/173B23K35/30C22C38/00C22C38/06
Inventor 上月涉平早川直哉大井健次
Owner JFE STEEL CORP