Influence of phosphor in high strength steel on welding quality in laser welding

ZHANG Wu; YANG Xing-liang; LIU Yong-gang; ZHAO Yong

doi:10.3969/j.issn.1001-3806.2011.03.004

In order to study effect of phosphor on welding quality of high strength steel, 4.8mm thick P-added high strength interstitial free steel M250P1 was welded with a 12kW CO2 laser. For different welding parameters, different welding nodes were obtained, and their tensile dynamic property, microstructure and scanning electron microscope energy spectrum were observed. The results show that: for given welding parameters, the weld joints show good tensile and forming property, however, crack is prone to happen on the fusion zone because of the toughness reduction induced by phosphorus microsegregation in the fusion zone. The phosphorus element in the fusion zone hadn't enough time to diffuse and aggregated on the grain boundary when the fusion metal was quickly cooled after weld.

Influence of phosphor in high strength steel on welding quality in laser welding

1. Technology Center, Maanshan Iron & Steel Company Limited, Maanshan 243000, China

Received Date: 2010-07-19

Accepted Date: 2010-10-08

Available Online: 2011-05-25

Abstract: In order to study effect of phosphor on welding quality of high strength steel, 4.8mm thick P-added high strength interstitial free steel M250P1 was welded with a 12kW CO2 laser. For different welding parameters, different welding nodes were obtained, and their tensile dynamic property, microstructure and scanning electron microscope energy spectrum were observed. The results show that: for given welding parameters, the weld joints show good tensile and forming property, however, crack is prone to happen on the fusion zone because of the toughness reduction induced by phosphorus microsegregation in the fusion zone. The phosphorus element in the fusion zone hadn't enough time to diffuse and aggregated on the grain boundary when the fusion metal was quickly cooled after weld.

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Reference (12)

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Influence of phosphor in high strength steel on welding quality in laser welding

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通讯作者: 陈斌, bchen63@163.com

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