Scholarlink

Abstract <p>The main aim of this work was to verify the maximum load (up to rupture) supported in bending tests, by <i>as-welded connections</i> between column-to-beam on square hollow section assemblies—also known as T-joints between brace-to-chord members—made from a high-strength steel, produced through a controlled thermomechanical rolling process developed by SSAB Special Steels and marketed as Strenx®700MC. Through Gas Metal Arc Welding using AWS ER120S-G (metric AWS ER83S-G) electrode, eighteen full-scale beam-to-column connections were produced varying heat input (0.3 to 1.6&#xa0;kJ/mm) and the following joints configurations: (i) longitudinal configuration (joint and load in the same direction), with flare-bevel-groove welds filled flush and end returns fillet welds; (ii) transverse configuration (joint and load in perpendicular directions), with fillet welds and end returns flare-bevel-groove welds filled flush; (iii) full contour configuration, with longitudinal and transverse joints as described. Static strength results from bending tests of these <i>as-welded</i> full-scale prototypes were compared with finite element analysis, to evaluate the effects of heat input and joint configuration, and heat input of 1.2&#xa0;kJ/mm in longitudinal joints achieved better overall performance, for they have shown acceptable weld geometry, mechanical strength, and heat-affected zone degradation (“softening”). However, for maximum design safety, it is suggested that the heat input is kept equal to or less than 1&#xa0;kJ/mm, which is the manufacturer’s recommendation for this steel. Finite element analysis identified critical stress regions, confirmed experimental trends and, most importantly, showed the difficulty in designing welded joints when the intensity of the reduction in mechanical strength of the heat-affected zone is unknown. In turn, statistical analysis demonstrated the significant effect of heat input and weld configuration on the ultimate load, with longitudinal welds showing superior strength-to-cost efficiency. The findings provide practical insights for optimizing welded joint design in high-strength steel SHS structures.</p> Graphical Abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Static Bending Behavior of Welded Connections between Columns-to-Beam Square Hollow Sections in Strenx®700MC High-Strength Steel

  • 期刊论文

  • 发表日期：

    2025年10月10日

查看全文
  • Rafael Luciano Dalcin,
  • Luis Fernando Nicolini,
  • João Ricardo Boff Preichardt,
  • Cristiano José Scheuer,
  • Richard Thomas Lermen,
  • Ivan Guerra Machado

摘要

Abstract

The main aim of this work was to verify the maximum load (up to rupture) supported in bending tests, by as-welded connections between column-to-beam on square hollow section assemblies—also known as T-joints between brace-to-chord members—made from a high-strength steel, produced through a controlled thermomechanical rolling process developed by SSAB Special Steels and marketed as Strenx®700MC. Through Gas Metal Arc Welding using AWS ER120S-G (metric AWS ER83S-G) electrode, eighteen full-scale beam-to-column connections were produced varying heat input (0.3 to 1.6 kJ/mm) and the following joints configurations: (i) longitudinal configuration (joint and load in the same direction), with flare-bevel-groove welds filled flush and end returns fillet welds; (ii) transverse configuration (joint and load in perpendicular directions), with fillet welds and end returns flare-bevel-groove welds filled flush; (iii) full contour configuration, with longitudinal and transverse joints as described. Static strength results from bending tests of these as-welded full-scale prototypes were compared with finite element analysis, to evaluate the effects of heat input and joint configuration, and heat input of 1.2 kJ/mm in longitudinal joints achieved better overall performance, for they have shown acceptable weld geometry, mechanical strength, and heat-affected zone degradation (“softening”). However, for maximum design safety, it is suggested that the heat input is kept equal to or less than 1 kJ/mm, which is the manufacturer’s recommendation for this steel. Finite element analysis identified critical stress regions, confirmed experimental trends and, most importantly, showed the difficulty in designing welded joints when the intensity of the reduction in mechanical strength of the heat-affected zone is unknown. In turn, statistical analysis demonstrated the significant effect of heat input and weld configuration on the ultimate load, with longitudinal welds showing superior strength-to-cost efficiency. The findings provide practical insights for optimizing welded joint design in high-strength steel SHS structures.

Graphical Abstract