Properties Of Steel Weld Metals Research Articles

The assessment of carbon equivalent formulas in predicting the properties of steel weld metals

The susceptibility to cold cracking in steel welds can be assessed by using carbon equivalent formulae based on the composition of steel being welded. In this study, carbon equivalent formulae available in literature have been tested for their sufficiency on what they can measure in weld metal properties by performing calculations using compositions of structural shielded metal arc welding (SMAW) steel weld metals. A set of correlation data was produced to demonstrate the level of relationship between the microstructural and mechanical properties of weld metals and carbon equivalent values. It is shown that carbon equivalent formulae are designed to measure certain mechanical performance of the steel weld metals as well as their hardness rather than microstructural content. A new formula is also proposed to predict weldability by including Ti content of the steel weld metal.

Ａｒ‐ＣＯ２‐Ｏ２雰囲気における鋼溶接金属の機械的性質について ガス・メタル・アーク溶接における鋼溶接金属の機械的性質について 第２報

Ａｒ‐ＣＯ２‐Ｏ２雰囲気における鋼溶接金属の機械的性質について ガス・メタル・アーク溶接における鋼溶接金属の機械的性質について 第２報

Ａｒ‐Ｏ２，Ａｒ‐ＣＯ２およびＣＯ２‐Ｏ２雰囲気における鋼溶接金属の機械的性質について ガス・メタル・アーク溶接における鋼溶接金属の機械的性質について 第１報

In an oxidizing gas welding atmosphere of Ar-O2, Ar-CO2 or CO2-O2 gas mixture, mechanical properties of steel weld metal such as ultimate tensile strength and Charpy impact property have been investigated, using a popular Fe-Si-Mn electrode wire (YGW 12) and rolled steel for welded structure (SM 400B). As an addition of oxygen to argon-based mixture, both the tensile strength and toughness tend to decrease. As an addition of carbon-dioxide to argon-based mixture, the tensile strength decreases and then improves, and impact property reveals complex behavior. As an addition of oxygen to carbon-dioxide-based mixture, changes in atmospheric gas composition have a minor effect on the mechanical properties of steel weld metal.

Microstructure and Properties of Steel Weld Metals

Microstructure and Properties of Steel Weld Metals