Underwater Overhead Welding Services

The overhead underwater welding is one of the most difficult welding techniques, because the diver–welder requires to possess great skill and precision during this operation, parallel fighting with the gravity that is created between the diver and the work-piece (underwater). BEVALDIA provides well trained and certified divers to accomplish the overhead  underwater welding, whenever it is requested or judged necessary, by providing guaranteed results.

Mr. Peroukidis George (Mechanical Engineering – Educator) is his notes states that: “The current volume must be as low as possible. To achieve a great penetration until it reaches the root of the rupture, there must be a preparation for the peak; even to the smallest and thickest metal (higher than 3mm). The movement of the diver – welder must be circular. The electrode must form an angle 80° degree, almost vertical, compelling the electro welder to be carefully protected. A drop of molten metal reaches the temperatures of 2000 °C”

For best results for underwater overhead welding, it is required to keep an upward direction of the electrode and a short arc seam, in combination with low work rate, as to achieve:

• Motion control, against gravity
• A better possible penetration to the cracks (rupture)
• Avoidance of porous seam welding

This technique is usually preferred to any material heavier than sheet metal. In contrast, the welding can also be done by descent of the electrode, when the metal plate is to be welded, and does not need much penetration. It is worth noting that the difficulty of underwater overhead welding, which is mainly located is  in the fight against gravity, by experienced divers, since the technique of underwater overhead welding  requires that welding is performed just above the height of the head of the diver and with very low welding speed, increasing working time to achieve the desired and accurate result.