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Underwater welding – wet welding

underwater welding is the connection of metal structures. to be interlocked by welding It lies deep in rivers, seas, oceans and other surrounding bodies of water.

underwater welding work It has been in use for decades. Occurred for the first time in England Beginning at the British Navy’s shipyard in 1946

The developer and inventor of a special waterproof electrode is Van der Willingen.

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Works that require submerged welding technology include submerged parts of ships. or submarine including offshore structures which consists of Oil rigs, submersible oil and gas pipelines, pipe anchors or underwater structures. Because of the above structure, whether during work or not work, there will be deterioration, cracking or damage from natural disasters. Whether it’s storms, ripples that hit the structure all the time. Most of these damages can be solved by using underwater welding.

Wet welding is welding in water. with water around the welder and the work to be welded

Operation of underwater welders Must be immersed in water in direct contact with water. There are special waterproof electrodes for welding. And welding will require technicians who are skilled enough to do welding work. It is a popular welding job. and effective to a certain extent be economical The power supply part of the welding located on the surface above the water The wires are then connected to the welders or divers via cables or hoses.

In wet welding using a metal worker (Manual metal arc welding: MMA) is used.

Power Supply – Direct Current: DC

Connector (Polarity) – Use the negative electrode to connect the electrodes (-ve polarity).

If direct current is used as a positive polarity (+ ve polarity), electrolysis will occur. (Electrolysis: is the separation or extraction of chemicals by electrolysis (chemical)) occurs, causing rapid deterioration of the welding electrode.

The prohibition of wet welding is that Alternate Current (AC) will not be used for welding. Due to the safety of those who are underwater And it is difficult to maintain. than direct current

A generator will generate a power source. and supply about 300 to 400 amperes of electricity to the welding machine. As mentioned, the positive terminal is grounded on the hull. or structure and then uses the negative terminal to connect There will be a blade switch to cut / connect electricity above the water surface or on the boat. Can be operated by an underwater welder for the safety of the welder.

Use direct current by choosing to connect the negative terminal to the welding pliers. Hold the wire that is waterproof. The wires are stranded copper. and use a special waterproof insulator around it to prevent danger when used underwater. (Even if it is direct current, it must be protected first) both the negative and the positive terminals.

type of welding wire

It has the same properties as AWS E6013 type electrodes, with the difference being that the submersible electrodes must be waterproof. There must be a good insulating flux to prevent water from coming into contact with the metal rods. Because if the sheath flux breaks, there will be leakage of electricity, seawater will come into contact with the surface of the metal rod. and will cause the welding machine to supply electricity continuously. As a result, arc welding cannot be performed as effectively as it should be. or unable to weld arc at all because of leakage current before it reaches the end of the welding wire. It will also cause the wire to deteriorate itself quickly. Check out 10.10 0.1 piso wifi pause where you can get more information. 

Wet welding principle

The welding operation is connected to the electrical circuit at the welding machine on one side. and the welding headset is on the other side. Both of these parts are connected in a circuit. When welding, the welding head is slightly raised. A spark (arc) is generated, causing the metal to melt and then dragging the welding electrode to feed the molten pond along the weld line. At the same time, flux will be generated covering the weld. This flux may be covered with inert gas or incense sticks with flux covering the incense stick to cover the weld. This shielding flux provides stability in the arc weld beam. The design of the incense stick welding wire is designed to The chemical flux burns a little slower than the solder wire. is to cover the welding line

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