52results about How to "Meet welding quality requirements" patented technology

The invention relates to the field of welding fabrication of hydraulic support structure members, particularly to an automatic welding method of a flow production line for hydraulic support grid box type structure members, which solves the problem that the traditional manual welding method cannot guarantee the welding forming quality and workpieces cannot be completely and automatically welded due to deformation caused by a unit type automatic robot due to thick plate welding thermal cycle. The automatic welding method comprises the following concrete steps of: cutting and forming the grid box type structure members; automatically counting and assembling bottom plates and main rib plates; preheating the counted and assembled bottom plates and main rib plates; automatically welding the main rib plates; automatically counting and assembling separation plates; preheating the counted and assembled separation plates; automatically welding the flat joints of the separation plates; automatically welding the left vertical joints of the separation plates; automatically welding the right vertical joints of the separation plates; counting and assembling function parts; counting and assembling cover plates; automatically welding the flat joints of the cover plates; automatically welding the arc joints of the cover plates; and circulating the above steps. The method provided by the invention is reasonable and simple in process, strong in operability and high production efficiency, and can guarantee the welding quality.

The invention provides a gas shielded welding technology of steel Q420GJC for a building structure. The technology comprises the steps that a welding material is prepared, wherein welding wires WH5-GJ with the diameter phi of 1.2 mm are prepared; the welding environment temperature is higher than or equal to minus 10 DEG C; the preheating temperature is 100 DEG C-150 DEG C; multi-layer and multi-pass welding is performed, and the interlayer temperature is no lower than the preheating temperature; weld joint priming is performed, wherein the welding current is 240-260 A, the welding voltage is 26-28 V, the welding speed is 30-32 cm / min, and heat input is performed at 9.4-10.2 KJ / cm; weld joint filling is performed, wherein the welding current is 280-300 A, the welding voltage is 28-30 V, the welding speed is 34-36 cm / min, and heat input is performed at 10.4-11.3 KJ / cm; weld joint capping is performed, wherein the welding current is 300-320 A, the welding voltage is 28-30 V, the welding speed is 36-38 cm / min, and heat input is performed at 10.5-11.4 KJ / cm. Q420GJC steel welding is performed by adopting the welding technology, the mechanical property same as that of base metal is obtained, the quality requirements of engineering welding are met, and a gap of gas shielded welding of the Q420GJC steel is filled.

The invention discloses an explosive welding method for bimetal composite boards with special quality requirements. The explosive welding method includes preprocessing blanks; charging powder; and performing explosive welding. In a powder charging procedure, 'basin'-shaped powder charge bodies are arranged on shroud plates and extension plates, upper and lower surfaces of the powder charge bodies are parallel to the shroud plates and the extension plates, and powder charging quantities are acquired by computing according to a formula. The welded rate of the composite boards welded by the explosive welding method reaches 100%, the bonding strength of welded surfaces of the bimetal composite boards meet a bimetal solid-phase metallurgical bonding strength law, bonding interfaces of the bimetal composite boards are finely wavy and are excellent in quality, and accordingly the quality requirements of critical equipment of thermonuclear fusion power generation test reactors on the composite boards are met.

The invention discloses a union melt welding process for steel Q420GJC for building structures. Welding materials include a welding wire MCJ55GJ with a diameter being phi 4.0mm and a welding flux SJ101; a welding environment temperature is higher than or equal to -10 DEG C; a preheating temperature is 100-150 DEG C; multi-layer and multi-pass welding are adopted, and an interlayer temperature is not lower than the preheating temperature. Conditions of backing weld include that a welding current is 520-530A, a welding voltage is 28-30V, a welding speed is 34-35.5cm / min, and thermal input is 21.3-22.8KJ / cm. Conditions of filling weld include that a welding current is 530-540A, a welding voltage is 30-32V, a welding speed is 36-37cm / min, and thermal input is 22.5-23.8KJ / cm. Conditions of cosmetic weld include that a welding current is 535-545A, a welding voltage is 28-30V, a welding speed is 34-35cm / min, and thermal input is 22.4-23.8KJ / cm. By the union melt welding process, equality in mechanical property of welds and base materials can be realized so as to meet requirements on engineering welding quality, and a gap of union melt welding of the steel Q420GJC is filled.

The invention provides a gas shielded welding technology of steel Q420GJC for a building structure. The technology comprises the steps that a welding material is prepared, wherein welding wires WH5-GJ with the diameter phi of 1.2 mm are prepared; the welding environment temperature is higher than or equal to minus 10 DEG C; the preheating temperature is 100 DEG C-150 DEG C; multi-layer and multi-pass welding is performed, and the interlayer temperature is no lower than the preheating temperature; weld joint priming is performed, wherein the welding current is 240-260 A, the welding voltage is 26-28 V, the welding speed is 30-32 cm / min, and heat input is performed at 9.4-10.2 KJ / cm; weld joint filling is performed, wherein the welding current is 280-300 A, the welding voltage is 28-30 V, the welding speed is 34-36 cm / min, and heat input is performed at 10.4-11.3 KJ / cm; weld joint capping is performed, wherein the welding current is 300-320 A, the welding voltage is 28-30 V, the welding speed is 36-38 cm / min, and heat input is performed at 10.5-11.4 KJ / cm. Q420GJC steel welding is performed by adopting the welding technology, the mechanical property same as that of base metal is obtained, the quality requirements of engineering welding are met, and a gap of gas shielded welding of the Q420GJC steel is filled.

An anti-blocking processing system for welding gun nozzles for carbon dioxide arc welding is used for solving the blocking problem of the welding gun nozzles for the carbon dioxide arc welding. The anti-blocking processing system for the welding gun nozzles for the carbon dioxide arc welding comprises a liquid storage tank, a splash-proof liquid spraying device, welding gun placing supports and a PLC (Programmable Logic Controller) control mechanism; the liquid storage tank is filled with splash-proof liquid; a compressed air inlet pipe is arranged at the top of the liquid storage tank; liquid outlet pipes are arranged at the bottom of the liquid storage tank; the splash-proof liquid spraying device comprises a group of splash-proof liquid spraying units which are in series connection with the liquid outlet pipes of the liquid storage tank; the number of the splash-proof liquid spraying units is matched with that of welding guns in welding production lines; movements of the splash-proof liquid spraying units are controlled by the PLC control mechanism; the welding gun placing support is arranged at the tail end of every splash-proof liquid spraying unit. The anti-blocking processing system for the welding gun nozzles for the carbon dioxide arc welding has the advantages of reducing labor intensity of operators, improving welding production efficiency, effectively avoiding the welding gun nozzles from blocking caused by splashing of welding slags and poor electric conduction between a contact nozzle and a welding wire and caused by a processing method of dipping anti-blocking paste and satisfying a workpiece requirement for welding quality.

The invention discloses a welding method of inner rib plates in a lower reactor core shell base in a high temperature gas cooled reactor, which can control maximum deformation of a baseplate to be not higher than 9.6 mm. After an inner cylinder, an outer cylinder and the baseplate are welded, and 15 inner rib plates are uniformly distributed between the inner cylinder and the outer cylinder, parts needing to be welded are preheated to above 205 DEG C; after the preheating is finished, the positioning welding is performed for the outer cylinder and the inner rib plates, and the inner cylinder and the inner rib plates; then, the multi-layer and multi-way welding method is adopted to weld the inner rib plates and the outer cylinder; and finally, the inner rib plates and the baseplate are welded. The welding method has the following advantages: the method can control the maximum deformation of the baseplate to be not higher than 9.6 mm, is firm in welding, satisfies the welding quality requirements on the nuclear power aspect, and prolongs the service life of the base.

The invention discloses a method for welding an outer cylinder in a reactor core vessel base and a base plate in a high-temperature gas cooled reactor. By the adoption of the method, the maximum deformation of the base plate can be controlled to be 9.6 mm or below. An inner cylinder tool and an outer cylinder tool are placed on a site, then the base plate is placed on the inner cylinder tool and the outer cylinder tool, welding portions are preheated, the welding portion of the outer cylinder is divided into eight welding areas: a, b, c, d, e, f, g and h with the same arc length in the circumferential direction clockwise, positioned welding is conducted after preheating, and then a multi-layer multi-pass welding method is adopted. The multi-layer multi-pass welding method specifically comprises the steps of three-layer welding of an internal groove, three-layer welding of an external groove, welding of the fourth layer and the fifth layer of the internal groove, welding of the fourth layer and the fifth layer of the external groove, complete welding of the internal groove, and complete welding of the external groove. The method has the advantages that the maximum deformation of the base plate can be controlled to be 9.6 mm or below, welding is firm, the requirement of the nuclear power field for welding quality is met, and the service life of the base is prolonged.