Abstract: This paper reviews the generation background and toughening and strengthening mechanism of the Ultra low Carbon Baninitic (ULCB) welding consumables, together with the effecting factors on the properties of weld metals. both of the shielding gas and the welding process play an important role in the toughness of ULCB weld metals. Microstructuresand hardness are insusceptibility to the cooling rates. The productivity should be settled when this consumables are extensively applicated to industrial production. The properties will increase tremendously if efforts are made to control the size of the oxygen inclusions and destroy columnar grain structure in the weld metals.