Double-clad pole arc Welding Electrode, etc. is Professor Zou Zengda invented a new type of arc welding method with high efficiency, quality and so on. Double-pole electrode deposited mechanized production is the implementation of the new welding technology, one of the keys. Double-clad pole and general welding electrode is very different from its internal and contains two parallel insulated welding core, non-circular shape leather medicine, manufacturing difficulties, at home and abroad there is no equipment to produce the electrode .
25 tons double-pole electrode coated press deposited research project, designed a novel guide wire tube, guide wire mouth, setting mode, set away from the mold, wire wheels, push wire control system and enforcement agencies to address the two wire synchronous flush feeding, long for, the eccentric adjustment key technical problems. The successful development of this project is two-pole electrode arc welding deposition of new technology implementation and application to provide technical support.
Marine facilities such as offshore drilling platforms and undersea pipelines installation and maintenance, requires better underwater welding and cutting methods. Requirements process method is safe, high efficiency, good quality of welded joints, equipment reliability and easy as possible.
1, "dry" underwater welding
"Dry", also known as indirect method diving bell underwater welding or soldering, apply compressed air to discharge the water inside the diving bell, in a certain pressure (and in which the water depth equivalent) of gas welding environment.
"Dry" use more tungsten welding arc welding filler wire, this method can be no more than 300m of water in the depths of Welding Electrode, but productivity is low, it is generally only used for welding the back cover, cover the skin surface electrode manual arc still medication welding. Welding fumes inside the clock must be purified or eliminated.
"Dry" quality of welded joints can be welded on to the land level, but adaptive narrow (used for submarine pipeline welding), supporting a long time, high cost, and within minutes the probability of explosion. Therefore, the application subject to certain restrictions.
2, "wet" underwater welding
"Wet" welding and sub-drainage is generally wet and partially wet. Generally wet welding is characterized by: (1) wide adaptability, convenient and flexible, low cost; (2) in water and low visibility diving welder poor stability in water, difficult operation; (3) the high hydrogen content of weld metal , could easily lead to hydrogen embrittlement, porosity, and cracks; (4) fast cooling rate, weldments, welded joints prone to high hardness and microstructure of slag, lack of penetration defects, low plasticity and toughness of welded joints.
"Partial drainage" wet welding. The joint quality than the average wet welding has improved significantly. Weld metal and heat affected zone does not exceed the maximum hardness of HV350. Joint mechanical properties can be achieved on the land electrode of the welded joints acid level.
3, the welding power
Underwater welding machines used for arc welding and gas welding power supply on the same land. Manual arc welding current should be higher than on land generally is 10 to 15%. ≤ 0.42% of the carbon equivalent of carbon steel or low alloy steel, optional or H08Mn2Si special wire electrode 202. Of carbon equivalent> 0.42% of low-alloy steel weld metal or require higher performance or position of the impact of crack resistance, the choice of chrome-nickel stainless steel or nickel-and gold (such as Inconel Ni70Cr20Mo10) soldering materials. Blowing force, waterproof, anti-porosity and other characteristics.
4, the application
Local drainage in semi-automatic welding gas drilling platform jacket fixed rod repair and replacement, in the subsea pipeline repair, replacement and additional pick "three links" pipe welding and other underwater engineering has been applied. Welding work depth of about 38 meters, welding pipe working pressure up to 140Kgf/cm2. Joint quality land to meet the requirements of the appropriate structure of rules.
Special welding electrodes 202 of the salvage and the reservoir gate in welding repair and replacement of water pipe, bridge pier construction, welding of steel sheet pile wharf and other aspects of the application.
He asked the process method is safe, high efficiency, in particular, requires good quality of welded joints, which, in particular to recommend the company a special-purpose welding rod - TECH16080 alloy electrode with water.
Underwater welding TECH16080 it can be all-position welding, can also be vertical down welding of high-quality alloy Cast Iron Welding Rod. It has good mechanical properties, that is, high strength, good ductility and toughness. Its outstanding feature is available with water welding, the process performance, easy operation, stable arc, little spatter, bead appearance, easy slag removal, easy arc and the arc, and AC and DC.
It is suitable for high-quality carbon steel, low alloy high strength steel, particularly suitable for small pieces of the original board, short welds, intermittent welds and smooth capping safety.