Vacuum device for tightness detection of 45 degree fillet weld at CM node of LNG ship

Abstract

The invention relates to a vacuum device for tightness detection of a 45 degree fillet weld at a CM node of an LNG ship. Structure of the vacuum device comprises a panel, sealing plates, surrounding plates and rubber sponges. The panel is a rectangular edge folded panel (1), one of the long edge is a right-angle folded edge, the other long edge is a 135 degree folded edge, a first sealing plate (2) is fixed at the right-angle folded edge, a second sealing plate (3) is fixed at the 135 degree folded edge, surrounding plates (5) is fixed to each of two short edges of the edge folded panel (1), afourth sealing plate (6) and a third sealing plate (5) are arranged at the edge of the surrounding plates (5) and are perpendicular to the surrounding plates (5), rubber sponges (9) are fixed to eachof sealing plates to form a sealed cavity (6), the edge folded panel (1) is further provided with two joints (9) and a handle (8). The vacuum device for the tightness detection of the 45 degree fillet weld at the CM node of the LNG ship can overcome a difficulty that conventional vacuum cover cannot detect, and improves construction efficiency of the LNG ship cargo tank.

Description

technical field [0001] The invention relates to shipbuilding, in particular to a vacuum device used for tightness detection of 45° fillet welds at CM nodes in LNG shipbuilding. Background technique [0002] During the construction of LNG ships, there are many CM nodes with the same angle in the liquid cargo tank. After the segmental construction is completed, the fillet welds at the nodes need to be tested for tightness. The fillet weld formed by the side plate is 45°, and the distance between the formed fillet weld and the end of the platform plate is only 15mm. Since the installation and maintenance system of the liquid cargo tank takes a long time, the weld tightness test is required to be carried out in sections, The general stage is completed, and the only suitable method for testing the tightness of the weld at this stage is the vacuum test. [0003] According to the vacuum test device commonly used in the current technology, it can generally only satisfy the detectio...

AI Technical Summary

Problems solved by technology

[0003] According to the vacuum test device commonly used in the current technology, it can generally only meet the detection of welds where the ends of the two structural surfaces of the formed fillet welds are far away from the welds. For LNG ships, the CM At the node, because the weld seam is too close to the end of the platform, ordinary vacuum hoods cannot detect the tightness of the 45° weld seam there

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