FEATURE NEWS:
Solid wire for welding high-strength bridge steel
One of Japan's leading steel companies, Kobe Steel Ltd provides the industry with a wide range of steel products, including wires and wire rods. The company's engineering services segment builds sewage treatment plants, bridges, and similar projects. A diversified manufacturer, Kobe Steel also makes aluminium, copper, and titanium products, and produces welding consumables such as welding fluxes.
In the construction of steel structures, bridges, machinery and pressure vessels, Kobe Steel offers MG-60, a dependable CO2 solid wire for welding 590N/mm2-class high-strength steel. MG-60 offers persistent mechanical properties and usability with a stable arc in uses over a wide range of welding currents. The unique chemical composition and production process of MG-60 assure excellent mechanical properties and usability. Both 0.2% proof strength and tensile strength decrease as the soaking time in post-weld heat treatment increases. The two strengths, however, are maintained adequately even when the soaking time is extended to 10 hours. Post-weld heat treatment causes a decrease of impact absorbed energy of low-alloy high-strength steels and weld metals due to SR embrittlement in general. MG-60 weld metal, however, maintains its impact notch toughness at a sufficient level even after an extended postweld heat treatment.
The method of controlling the strength and toughness of welds is essential in welding, particularly, high-strength steel. Both strength and toughness are affected by the cooling speed of the weld during welding. The cooling speed varies according to heat input and interpass temperatures. Therefore, heat input and interpass temperatures are very important parameters to control strength and toughness of welds. MG-60 offers a stable, gentle arc with low spatter of fine particles when compared with conventional solid wires when proper currents and arc voltage are used. The use of MG-60 can decrease the amount of spatter by approximately 15% when compared with a conventional wires.
Company: |
Kobe Steel Ltd |
Country: |
Japan |
Fax: |
+81 78 261 4123 |
Email: |
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Website: |
www.kobelco.co.jp |