The welding of wire in construction generally includes: flash butt welding, resistance spot welding, arc welding, electro slag pressure welding, the submerged arc pressure welding of T joint of embedded parts, and the pressure welding of reinforcement.
Sampling method:
1. Flash butt welding: 300 welding joints of the same grade and same diameter steel bars in the same working class shall be taken as one inspection batch completed by the same welder. If there are less than 300 joints in the same class, it is also used as a test batch. The mechanical property test includes tensile test and bending test. Six specimens should be cut from each batch of finished products, three of them for tensile test and the left for bending test. The length of the tensile specimens is generally greater than or equal to 500mm (500~650mm). The length of cold-bending specimens is generally greater than or equal to 250mm (250~350mm).
Acceptance method:
(1) the joint shall not have transverse lines;
(2) contact with the electrode surface of the steel, Ⅰ ~ Ⅲ grade steel welding cannot have obvious burns; When Ⅳ grade steel welding shall not be burned; Negative temperature flash butt welding, for steel Ⅱ ~ Ⅳ level, shall burn;
(3) the bending Angle at the joint shall not be greater than 4. ;
(4) the deviation of the reinforcement axis at the joint shall not be greater than 0.1 times the diameter of the reinforcement and at the same time shall not be greater than 2mm.
2. Resistance spot welding: welding products of the same grade, diameter and size of steel bars shall be of the same type, with each batch of 200 pieces.
3. Electric arc welding: under the field installation conditions, 300 joints of the same type (same with steel bar level, same with joint type and same with welding position) are used as one batch on each floor. If less than 300 joints, they are still used as one batch. Three joints were cut from each batch of finished products for tensile test, and the length of the specimen was generally more than 500 mm (500~650mm).
4. Electro slag pressure welding: in general structures, every 300 joints of the same type (the same level of steel bar and the same welding position) are used as one batch; In cast-in-situ concrete frame structure, 300 joints of the same type are used as a batch in each floor. 3 joints were cut from each batch of finished products for tensile test, and the length of the specimen was generally more than 500 mm (500~600mm).
Acceptance method:
(1) the joint welding bag shall be uniform and free from flow blisters and cracks. The width and thickness of the welding bag from the steel bar surface to its outer edge shall be 2mm or more, and the thickness shall be 4mm or more;
(2) during welding, the steel bar shall not have obvious burns on the surface, and its zero line shall not be connected to the main reinforcement of the component;
(3) the deviation of the reinforcement axis at the joint shall not be greater than 0.1 times the diameter of the reinforcement and at the same time shall not be greater than 2mm.
(4) the bending Angle at the joint shall not be greater than 4.
August 20, 2019The wire straightener is a maintenance machine for constructing steel bars of steel scaffolding. It is mainly used for straightening and correcting scaffolding steel bars and other pipes which are tor...view
October 19, 2018Diagnosis criterion for failure of rebar bending machine:1. Outside first, and then insideRebar bending machine is a large equipment with many parts. The repair personnel should check one by one from ...view
April 8, 20211. The design of the rebar stirrup benderThe unique design of the horizontal straightening mechanism of the rebar stirrup bender can straighten each rebar individually. With the right use, rebar stirr...view
August 26, 20181. Transportation of cage welding machine Horizontal transportation of reinforcing cage uses a flat plate car and fastens the reinforcing cage to narrow fastening.view
September 1, 2021Generally speaking, customers tend to pay more attention to the price of machinery and equipment when they choose to buy a steel bar cutting machine, but I want to remind everyone that if you want to ...view
November 22, 2020Rebar saw cutting production line has always been an intelligent rebar processing equipment promoted by TJK, which makes the processing simpler and saves energy and materials. No matter from the appea...view