Abstract
As a security unit for the territorial waters of the Republic of Indonesia, the Indonesian Navy is required for combat readiness to carry out security operations quickly and precisely. It is very important to the readiness of the Indonesian Navy's ABK Soldiers and the Republic of Indonesia's defense equipment for warships in carrying out security activities in the territorial waters of the Republic of Indonesia. This study discusses underwater wet welding in anticipating an emergency if the ship's hull is hit by a collision so that the hull has cracks or holes. This research method uses AH36 steel plate metal. Then, underwater wet welding was carried out on the AH36 plate using a low hydrogen type electrode. Before welding, the electrodes were subjected to a drying process to a temperature of 900C. Wet welding underwater is carried out at a depth of 5 meters in seawater. The results of underwater wet welding are NDT testing; penetrant test, radiography test, then also DT test; hardness test, tensile test, and test according to ASTM standard. Analysis of underwater wet welding results compared to atmospheric welding results as quality control, so that the percentage difference in mechanical properties can be known. The interesting thing from welding AH36 steel plate with underwater wet welding and applying low hydrogen electrodes is the minimal level of weld porosity defects in the welding results. So that the low hydrogen electrode can be used in welding AH36 steel plate in underwater welding applications.
Highlights
One of the main tasks of the Indonesian Navy is to defend the Unitary State of the Republic of Indonesia in the sea
From Table 4. data obtained from hardness tests on AH36 steel plate material on welding results at a depth of 5 meters, where the results of underwater wet welding at a depth of 5 meters with E7016 electrodes are compared with atmospheric welding results as quality control, there will be a percentage, difference The hardness test value will occur in the base metal (BM) and Heat Affected Zone (HAZ) regions
There will be a decrease in the value of hardness with a percentage decrease of 3% and 2.7%, while in the weld metal (WM) area there will be an increase in the value of hardness of 1.4%
Summary
One of the main tasks of the Indonesian Navy is to defend the Unitary State of the Republic of Indonesia in the sea. When carrying out operational tasks there are several obstacles. One of these obstacles is underwater line leakage (BGA). This leak was caused by several factors, including hitting logs, hitting rocks or other ships, which caused the hull to tear, crack, and deformation which reduced the strength of the hull material. This requires fast handling because the ship must continue to carry out operations while not all bases have docking facilities that are capable of supporting the repair of the KRI. Problem-solving that can be done is by underwater wet welding
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