Low C-steels (typically up to 0.3%C) can be satisfactorily laser welded and it has been reported that a sintered steel-part can be acceptably laser welded to a wrought counterpart, as long as both components have low carbon content. (W 141) (1)

Low carbon = Baixo carbono

Steel A had a high carbon equivalent and showed high weld/parent hardness overmatching. This is due to the formation of hard metastable phases such as bainite in the weld microstructure. (W 417) (2)

High carbon = Alto carbono

Just as with other microalloying routes vanadium-microalloying, by facilitating reductions in steel carbon content, can provide improvements in steel weldability. Moreover, there is now clear evidence that vanadium-microalloying canbring additional benefits, especially to weld joint toughness, by virtue of its influence on microstructural development. (W 427) (3)

Steel carbon = Carbono de aço

(1) Critical review of joining processes for powder metallurgy parts

C. Selcuk, S. Bond and P. Woollin

Metallurgy, Corrosion & Surfacing Technology Group, TWI Ltd, Granta Park, Great Abington, Cambridge, CB21 6AL, UK. T: +44 (0) 1223 899 000, F: +44 (0) 1223 894 717.

Paper presented at Euro PM 2008 Congress and Exhibition, Mannheim, Germany, 29 Sept – 1 Oct 2008.

(2) Microstructure & properties of autogenous high-power Nd:YAG laser welds in C-Mn steels

P L Moore 

University of Cambridge and TWI Ltd . D S Howse . TWI Ltd 

E R Wallach 

University of Cambridge 

Paper presented at 6th International Conference on Trends in Welding Research, 15 – 19 April 2002, Callaway Gardens Resort, Pine Mountain, Georgia.

(3) The influence of vanadium-microalloying on the weldability of steels

P H M Hart

Paper presented at Vanadium 2001. Vanadium Application Technology. International Symposium, Beijing, China, 12-14 Oct 2001.