Title

STUDY OF WELDABILITY OF HIGH STRENGTH LOW ALLOY STEELS WITH BORON AT LASER WELDING

STUDY OF WELDABILITY OF HIGH STRENGTH LOW ALLOY STEELS WITH BORON AT LASER WELDING

Authorship

LELIS, JEFFERSON LISBOA; GOUVEIA, MAIARA RODRIGUES; SILVA, MARCOS ROBERTO SOARES DA

LELIS, JEFFERSON LISBOA

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GOUVEIA, MAIARA RODRIGUES

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SILVA, MARCOS ROBERTO SOARES DA

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DOI

10.5151/2594-5297-32515

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Abstract

Nowadays, due the development of new hot rolled strips at USIMINAS, established the necessity of realizing studies to define new parameters for the welding machine of new pickling line, in order to improve the results of mechanical and metallurgical properties relation of these materials. This study, that was designed for study of weldability of high strength low-alloy steel with low boron content that overcomes 600 MPa of tensile strength, there was analyzed the influence of energy input and preheating temperature on mechanical properties of hot rolled strips at three distinct thickness (2, 4 and 6 mm). To evaluate the welding results, there were made tensile test, micro-hardness, metallography (micro and macro examination) and scanning electron microscopy analysis. Through the analyzing of the mechanical and metallographic tests, a better welding performance was verified, increasing the welding energy and the preheating temperature.

Nowadays, due the development of new hot rolled strips at USIMINAS, established the necessity of realizing studies to define new parameters for the welding machine of new pickling line, in order to improve the results of mechanical and metallurgical properties relation of these materials. This study, that was designed for study of weldability of high strength low-alloy steel with low boron content that overcomes 600 MPa of tensile strength, there was analyzed the influence of energy input and preheating temperature on mechanical properties of hot rolled strips at three distinct thickness (2, 4 and 6 mm). To evaluate the welding results, there were made tensile test, micro-hardness, metallography (micro and macro examination) and scanning electron microscopy analysis. Through the analyzing of the mechanical and metallographic tests, a better welding performance was verified, increasing the welding energy and the preheating temperature.

Keywords

Laser welding; Weldability; Low-alloy steel; carbon-boron steel

Laser welding; Weldability; Low-alloy steel; carbon-boron steel