Steel structure shear nail (bolt) construction points standard model

No. QC/RE-

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(Model text for regulatory norms)

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steelworkShear Nail (bolt) construction points standard model

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Steel Structure Shear Nail (Bolt) Construction Points

1 Materials and equipment used

(1) The diameter of the shear pins of the steel columns in the third basement is φ19mm, and the welding spacing is 200mm, and the acceptance should be carried out according to the specifications and quantities marked on the packages when the columns are delivered to the site. Need to set up a special warehouse for storage and storage, during the use of water and rain to pay attention to, in order to prevent the pegs from moisture and rust. Issuing and receiving should be carried out in accordance with the amount of use on the day, and the procedure of receiving and the registration of issuing should be established.

2) By equipping specialised welding equipment for the application of bolts, the welding machine to be greater than or equal to the temporary load rate of 15%, the selected bolts for the Japanese production of specific models, and equipped with A - 88J type torch, in the actual use of the process should focus on strengthening the bolts for the maintenance of the welding equipment as well as the maintenance of the work, in order to maintain its good welding performance.

3) The bolt welding machine shall be connected to an independent power supply, and the power transformer, whose capacity should be appropriate, shall be able to meet the demand for the use of bolt welding.

The bolted welder is located in the vicinity of the power distribution facility, where it needs to be protected from moisture, weather and sunlight, and has the necessary conditions and space for maintenance.

2 Bolting process

1) The bolting process is illustrated below:

The bolting process is shown in the bolting process flow diagram below:

(2) equipment selection inspection, peg material inspection activities, the presence of magnetic ring specifications and material project inspection (which penetrates the welding of the operation of the use of magnetic rings for the 8-tooth class, and must be used to maintain a dry state of the magnetic ring, and for the moisture of the magnetic ring, before being put into use must be drying treatment).

(3) for the welding parameters, there are two cases, one is directly welded on top of the steel beam, the other is to wear compression steel plate welding, and then welded to the steel beam, to select the appropriate welding parameters, the welding parameters are for penetration of galvanised sheet and penetration of cold rolled sheet, and the earth wire must be firmly connected, line, ground wire should have sufficient cross-sectional area.

(1) A pick-up line with a cross-section of 120 sq. ft. and a length of 50 metres. Ground line needs to use two, its cross-section is 120 square, the length is 12 metres, and the steel structure to be connected firmly, and with the steel structure to connect also have enough contact surface.

(3) Current: Direct welding on steel beam 1700A penetration welding 2300A

(4) Time: O.7 seconds for direct welding on steel beams, 1.2 seconds for penetration welding.

(5) bolts melted long and welded directly to steel beams 4 mm, penetrating one layer of steel plate 6 mm

(3) The weld seam of the compression steel plate and the steel beam should be long enough to pass the current of the bolted weld

4) Measuring and placing the bolt position line

(5) The surface of the beam should be cleaned up, and the location of the bolts on the surface of the beam should be able to be sanded with an angular grinding wheel to expose the surface of the metal.

6) Welding

(1) The bolting torch should be perpendicular to the weldment on the beam surface.

(2) When the bolts are fitted into the clips of the welding gun, press the clips firmly

(3) Bolt gun, bolt and steel beam compression before hooking the electric door

(4) Lift the nailer after the arc has stopped.

(7) bolt welding quality inspection, first of all to carry out the appearance of the inspection, to see whether the welding meat is uniform and full, the welding meat does not exist abnormal phenomenon, there is no bias welding situation. Then use a 4-pound hammer, in the peg welding meat condition is worse on the side, hit the peg head, so that the peg bent 15 degrees, so that is considered qualified. If it does not pass the test, a replacement weld will be made in the original position slightly off-set, and the bent peg will not have to be straightened out again.

3 Bolting test and inspection requirements

All pegs shall be visually inspected and 20 per cent of the total number of pegs shall be randomly selected for bending tests, with a minimum of two pegs per bar.

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