لحام القوس الكهربائي و الليزر للصلب الثنائي الطور

Abstract

The aims of this research are to study the weldability of low carbon steel thermally (through heating low carbon steel (0.15%) to (800) C˚ for 15 minutes and then water hardening in a electric arc welding and compared the normal situation (without welding) with Different volume fraction of Martensit.Search results that showed increasing the degree of incoming heat when electric arc welding led to obtain the fragility of the steel, and the reason for that is the growth of the grains when the thermal impact area either when laser welding did not lead to obtain such fragility that accompanied the electric arc welding and based on "the Results reached found that the weldability of steel decreases with increasing fraction volumetric Martensit because of the fragility of this phase hardwood. The effect of Strain Rate on steel behavior has been found that there is a decrease in steel sensitivity to the rate of emotion with real emotion values and high rates when the emotion of low-lying values result Austenite remaining turned into Martensit and then decrease steel sensitivity at a lower rate with the increase in the real emotion because of the increased hardening emotional, this is the same effect steel welded arc. While this effect is different for steel welded by laser beam where increasingly hard to rate emotional sensitivity in the beginning with increase the real emotion when the emotion of low-lying values and then gradually decreasing, "with the increase in the real emotion