33results about How to "Improve porosity resistance" patented technology

The invention provides a novel welding rod for a brazing process. The novel welding rod for the brazing process comprises a coating and a core wire; the coating wraps the core wire; sodium silicate and potassium silicate serve as adhesives; the coating adheres to the periphery of the core wire; according to components and the matching ratio, a, the components of the coating comprise 100 parts of marble, 60-100 parts of fluorite, 10-15 parts of silicate, 5-10 parts of aluminum fluoride and 25-35 parts of a multi-component alloy agent; and components of the core wire comprise smaller than or equal to 0.020% of C, smaller than or equal to 0.050% of Si, 0.40-0.60% of Mn, smaller than or equal to 0.006% of S, smaller than or equal to 0.006% of P, smaller than or equal to 0.05% of Cr, smaller than or equal to 0.05% of Mo, smaller than or equal to 0.05% of Ni, smaller than or equal to 0.05% of Ti, smaller than or equal to 0.05% of Cu, and smaller than or equal to 0.001% of As. The laser brazing welding rod little in splashing, low in slag inclusion and good in weld joint mechanical performance is researched and developed.

The invention relates to the field of welding wire manufacturing, in particular to a preparation method of an aluminum and aluminum alloy welding wire electrochemically plated with a Zn+Cu / Re composite coating and applied to robot welding. A pure aluminum or aluminum alloy wire rod is used as the matrix. Pretreatment, electrochemical plating of the Zn+Cu / Re composite coating and post-treatment areconducted on the surface. The electrochemically plated Zn+Cu / Re composite coating has the functions of reducing welding smoke, improving the porosity resistance of the welding wire and improving solid lubrication and meanwhile fills up pits in the surface of the welding wire matrix, and the electric conductivity and surface quality of the welding wire are improved; the bonding force and strengthof the Zn+Cu / Re composite coating are high, the aluminum or copper peeling phenomenon is avoided, the Zn+Cu / Re composite coating is high in compactness, good in rust resistance and resistant to wear,Zn can reduce welding smoke and splashes, and Re can refine plating layer crystals and reduce the void ratio; and meanwhile, molten bath stirring is enhanced, a molten bath is purified, crystals are refined, pores on the surface and on the inner portion of a welding joint are thoroughly eradicated, and the porosity resistance of the welding wire is improved.

Disclosed is a method for fabricating a seamless tube welding wire containing rutile cored powders by a mild-carbon steel strip. The method includes that by weight, 30%-50% of rutile, 2%-5% of dehydrated feldspar, 5%-10% of silicon iron, 1%-8% of ferrotitanium, 5%-15% of manganese metal, 2%-5% of zircon sand, 3%-8% of mineral magnesia, 2%-6% of quartz, 0.5%-2% of zirconium metal and the balance iron powders are fully and uniformly stirred to form the rutile cored powders, and the rutile cored powders are stored in a feeding device for stand-by, the mild-carbon steel strip is rolled to form a U-shaped steel strip, the cored powders are filled in the U-shaped steel strip at a rolling speed of 2-10m / s, the filling rate is controlled within 14%-18%, then a seamed tube in the diameter of D is formed by rolling, a seamless tube welding wire tube blank is formed by on-line welding of a laser-beam welding machine or a high-frequency welding machine, the seamless tube welding wire tube blank is subjected to high frequency annealing at 500-1200 DEG C, then the diameter of the seamless tube welding wire tube blank is reduced by a cold-drawn machine to form a D1 seamless tube welding wire, and then the D1 seamless tube welding wire is copperized so as to form the seamless tube welding wire containing the rutile cored powders.