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| New AEI welding power source |
05 November 2006 - Speciality Welds
AHW is an arc welding process that uses an arc between two tungsten electrodes in a shielding gas atmosphere of hydrogen. Filler may or may not be used. A jet of hydrogen is disassociated as it passes through an electric arc. H2 > H + H = 422kJ. The temperature of the arc is in excess of 3700 °C. |
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| Atomic hydrogen welding |
04 November 2006 - Speciality Welds
My job often involves working on interesting and unusual welding related projects and can take me to many a far-flung corner of the world. One such welding project involved a welding process you may have never even heard of, and I will confess, up to a few years ago I was only aware of it in books. The process is called Atomic Hydrogen. |
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| Basic techniques used - An extract from Underwater Welding - A Welder's Mate |
03 November 2006 - Speciality Welds
For successful wet-welding, whether you are an experienced or novice welder, the first thing you have to accept is the range of personal skills which may be used for surface welding, do not exist for underwater. Often when I speak to divers, I am asked if as a non-welder I can teach someone to weld to a satisfactory standard in two weeks. Well, barring any lack of basic co-ordination skills, the answer is yes. |
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| Principles of operation - An extract from Underwater Welding - A Welder's Mate |
02 November 2006 - Speciality Welds
Manual metal arc welding is still one of the most important fusion welding processes, for both surface and underwater welding in today’s construction industries. American terminology refers to it as Shielded Metal Arc Welding. The definition of fusion welding, as stated in BS 499: Pt 1 1991 states, “any welding process in which the weld is made between surfaces brought together to a molten state, without hammering or pressure”. Any arc-welding system in which the electrode is melted off to become part of the weld is described as metal-arc. Briefly, the process takes place in the following manner. The work to be welded is connected to one side of an electric circuit, via means of a cable. A flux-coated electrode is attached to a holder, also connected via a cable, both being attached to a power source. When the electrode makes contact with the work, an electrical contact is made. The electric current jumps the gap and causes a sustained spark (arc), which melts the base metal and the covering of the electrode forming a common weld puddle. |
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| Underwater Contractor International 23 Speciality Welds’ new system |
02 November 2006 - Speciality Welds
Underwater Contractor International 23 Speciality Welds’ new system, which has been named Hammerhead in keeping with the company’s ‘fish’ brand, addresses problems in obtaining high quality wet welds in nil visibility, without the need for experienced (skilled) welder-divers. |
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| Wet-stick welding is one of the methods used in underwater repair and construction |
01 November 2006 - Speciality Welds
As the name implies, the process is carried out with both the diver and welding electrode exposed to the water, suffice to say, that all commercial wetwelding operations shall be carried out by trained and certified commercial divers. In reviewing this process, one must understand the elements involved and the controlling factors, which are essential to a satisfactory outcome. |
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| New great reference manual for all experienced welders |
31 October 2006 - Speciality Welds
New It’s been 6 years in the planning and writing, but it’s here now. A must for any commercial diver involved and/or interested in welding. Get yourself ahead and learn the tricks of the trade the easy way. |
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| Semi-automatic MIG is not semi-skilled |
08 March 2005 - Speciality Welds
International welding technologist, David Keats, asks if readers involved in welding really know what the MIG/MAG welding process is all about and how welders can improve their techniques. |
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