The butt weld of the spiral plate surface in the spiral plate heat exchanger shall be 100% ray or ultrasonic test, and the full penetration structure shall be adopted. The residual height of the butt weld shall be smoothed in time to prevent the plate surface from being warped and used. Stress corrosion in. It is important to have a chamfer of 1~2X45° at one end of the fixed column, because the number of the fixed column is large and the surface of the spiral plate cannot be completely flat.
The height deviation of the fixed length of the spiral plate heat exchanger should be 0~0.3mm. Since the spiral plate is thin, special attention should be paid to controlling the welding quality during spot welding of the fixed distance column and the spiral plate, so as to ensure that the spiral body does not fall off during winding. Note that the arcing and arcing should not cause the bite of the board to occur. After the spot welding of the fixed column, the defects must be carefully checked and remedied in time to avoid the trouble caused by the leakage repair after the completion of the equipment.
The spiral steel plate end face sealing round steel is generally connected by several round steels to fill a spiral channel. The round steel hard fold should be straightened, the surface floating rust should be removed; when the round steel diameter is larger than 14mm, the rigidity is better. In the process of coiling and rolling, the inner ring and the membrane are not well fitted. At this time, the annealing length at the beginning of the round steel is more than 500 mm; the round steel can also be replaced by a slat.
The size of the central partition is also very important, and the allowable deviation of the width should be strictly controlled, generally 0-1mm; the joint between the central partition and the spiral plate must be controlled by the welding quality, in order to eliminate the cyclical effect of loading and unloading. For the damage of the weld, a modified central partition structure can be used.
The support ring of the spiral plate heat exchanger and the inner ring plate (central tube) closely fit to strengthen the strength and rigidity of the inner ring plate. In order to ensure the fit between them, the radius of the support ring is preferably according to the inner ring. The measured inner diameter of the plate (central tube) is made. When necessary, the support ring and the inner ring plate should be completely welded.
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