The article is concerned with issues related to the plasma welding of steel CPW 800 using titanium and niobium microagents. Plasma welding tests involving sheets subjected to TMCP were performed with various linear energy values. Welded joints were subjected to macro and microscopic metallographic tests, hardness measurements (involving the base material, HAZ and weld) as well as tensile and bend tests. The strength of the welded joints obtained in the tests was greater than that of the base material; a slight increase in the hardness of joint area ensured its relatively high plasticity.