Adjust the tensioner on the connecting rod so that the head flange gently presses the block
After machining, a certain amount of machining allowance must be left, and the components are then welded together. Following rough machining, a short tube and ribs are welded to relieve internal stress, after which the flange sealing surface is finished according to the drawing specifications. The general installation process for the 6.5m door neck involves first securing a 1500mm short tube to the main vessel. Once the joint and reinforcing ring are welded, the side door's large opening is cut. The excess (150mm) portion of the short tube is then trimmed based on the drawing dimensions. The groove is polished, and the short tube with the flanged section is lifted and welded onto the existing short tube.
The installation process for the 5m door neck follows a similar approach: welding and assembling the passenger cabin to the main container as per the drawings, including positioning the lower saddle and other components. Afterward, the excess part of the cabin is cut, the groove is ground, and the short section is lifted and welded to the opposite end. When welding the flanged section’s short tube with the cylinder’s short cylinder (cabin), it is crucial to polish the groove due to the high precision required for the flange and the need for an accurate flange surface post-welding. Every step—lifting, positioning, tack welding, and final welding—must be carried out carefully to avoid any deformation that could affect the flatness of the flange.
Given that the flange is in a vertical position and the site conditions are limited, measuring the flange’s flatness using standard instruments is challenging. To address this, the sealing surface of the flange is used as a reference point for measurement and adjustment. The specific welding method and sequence are as follows: a) hoist the short-tube with the flanged section, use a spherical tank fixture to level and adjust the gap between the two flanges; b) fabricate a temporary door frame, suspend the head using a reverse chain to a predetermined height so that it aligns with the door flange, leaving approximately 25 mm clearance. Four connecting rods equipped with elastic devices are evenly placed, with one end welded to the ellipsoidal head and the other to the main vessel wall. Three aluminum pads, each 100 mm long, 50 mm thick, and machined to 200+0.1 mm, are installed between the door flange and the head. Adjust the elasticity on the connecting rods so that the head flange gently presses against the pad; c) draw the bisector along the outer circumference of the door flange, spaced about 400 mm apart, and number them sequentially.
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