Upright 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, increased thermal influence of steel plate, complicated welding device, etc., to achieve less deposition and restrain welding heat Input, the effect of reducing welding construction cost
Active Publication Date: 2019-04-16
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
Method used
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[0123] Under the soldering conditions shown in Table 2, use image 3 As shown in the torch (θ3: 15°, l: 20mm) having a curved portion at the power supply tip, a narrow groove vertical upward gas shielded arc was performed on two steel materials having the groove shape shown in Table 1. weld.
[0124] Here, all the steel materials used include C: 0.04 to 0.06% by mass, Si: 0.1 to 0.2% by mass, Mn: 1.8 to 2.0% by mass, P: 0.01% by mass or less, S: 0.005% by mass or less, and Al: 0.02 to 0.06% by mass. %, O: 0.003% by mass or less, and N: 0.005% by mass or less, with the remainder being Fe and unavoidable impurities. In addition, gas cutting is used for beveling of steel materials, and processing such as grinding is not performed on the bevel surface.
[0125] In addition, as the welding wire, a solid welding wire of 1.2 mmφ is used for steel material strength or one grade higher than that. In addition, the composition of the welding wire other than REM shown in Table 2 contai...
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Abstract
An upright narrow groove gas shielded arc welding method for performing single-layer welding or multilayer welding employing weaving to join two thick steel materials having, as a prescribed groove condition, a plate thickness at least equal to 10 mm, wherein a welding wire containing a prescribed amount of REM is used, and weaving for initial-layer welding is performed using a welding torch provided with a bent portion and a tip end portion demarcated by the bent portion, and at this time, when performing weaving with respect to a groove surface of the thick steel materials, the tip end portion of the welding torch is caused to oscillate toward the groove surface of the thick steel material under prescribed conditions.
Description
technical field [0001] The invention relates to a narrow-groove gas-shielded arc welding method, in particular to a vertical narrow-groove gas-shielded arc welding method applicable to butt welding of two thick steel materials. [0002] Here, "narrow groove" means that the groove angle is 20° or less and the groove gap is 20 mm or less. Background technique [0003] Gas-shielded arc welding for steel welding construction is usually a separate CO 2 gas, or Ar and CO 2 The mixed gas is used to protect the melting part of the consumable electrode type. Such gas-shielded arc welding is widely used in manufacturing fields such as automobiles, buildings, bridges, and electrical equipment. [0004] However, in recent years, along with the increase in size / thickness of steel structures, the amount of welding during fabrication, especially in butt welding of steel materials, has increased, and more time is required for welding construction, resulting in Construction costs increas...
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