45results about How to "Fully deoxygenated" patented technology

The invention provides steel for a composite microalloying welding wire and a preparation method thereof. The steel is characterized by comprising the following chemical components in percentage by weight: no less than 0.06% and no more than 0.15% of C, no less than 0.81% and no more than 1.15% of Si, no less than 1.40% and no more than 1.85% of Mn, no less than 0.08% and no more than 0.15% of Ni, no less than 0.05% and no more than 0.15% of Cr, no less than 0.05% and no more than 0.15% of Mo, no less than 0.008% and no more than 0.012% of Ti, no less than 0.006% and no more than 0.030% of V, no less than 0.015% and no more than 0.025% of Nb, no less than 0.0005% and no more than 0.0030% of B, no more than 0.025% of S, no more than 0.025% of P, no more than 0.005% of O and the balance of Fe. The preparation method comprises the following steps of converting, ladle bottom argon blowing, LF refinement, fully-protected continuous casting, hot rolling and STELMOR cooling. The composite alloying provided by the invention is beneficial to refine molten drops, stabilize current and enhance the weld quality, and is beneficial to enhance the weld strength.

The invention discloses a seamless submerged arc flux-cored wire for steel with the yield strength being 550 MPa. The seamless submerged arc flux-cored wire is composed of a casing and flux core powder. The casing is a low-carbon steel strip. The flux core powder is prepared from, by weight, 8%-10% of nickel powder, 3%-6% of ferro-molybdenum, 10%-14% of manganese metal, 6%-8% of rare earth ferrosilicon, 3%-5% of ferrotitanium, 1%-2% of ferrozirconium, 1%-3% of ferro-boron, 1%-2% of potassium titanate, 1%-3% of sodium fluoride, and the balance iron powder. The seamless submerged arc flux-cored wire is extremely high in moisture absorption resistance and is matched with fluoride-basic type sintered flux SR-SJ613, the technical properties are excellent, diffusible hydrogen is smaller than or equal to 5 ml every 100 g (based on a gas chromatographic method), the Charpy impact energy at minus 40 DEG C reaches 100 J or over, and the seamless submerged arc flux-cored wire can be applied to welding of steels plates with the yield strength being 550 MPa in high-end technical fields such as ocean engineering and naval construction.

A TC4 titanium alloy flux-cored welding wire and a preparation method thereof. The invention belongs to the technical field of welding material preparation. The purpose of the present invention is to solve the problem that most of the existing welding wires for titanium alloy welding are solid welding wires, but the preparation process of solid welding wires is complicated, the cost of formula adjustment is high, and the deposition efficiency of the obtained welding wires in the welding process is low and the moistening effect is low. Technical problems of wetness and poor spreadability. The flux-cored welding wire is prepared from a TA1 titanium alloy sheath and a flux core; the TA1 titanium alloy sheath is made of a TA1 titanium strip through reeling, drawing, and annealing; the flux core is made of vanadium powder, aluminum powder, molybdenum powder, Cobalt powder, nickel powder, copper powder, silicon powder and titanium powder are mixed. Preparation method: first clean the TA1 titanium strip, ball mill the core powder, then reel the TA1 titanium strip, fill it with the core powder, roll and reduce the diameter, and then conduct cold drawing to reduce the diameter of the drawing die to obtain the flux cored welding wire. The flux-cored welding wire of the invention can be used for TC4 titanium alloy welding, has good comprehensive mechanical properties, low content of diffused hydrogen in deposited metal, and high welding efficiency.