NEW HANDY GUIDE: Electric Arc Welding by Jeffrey Casciani-Wood


The Institute is pleased to bring its twenty fifth handy guide to market, now available to purchase in either paperback or eBook pdf format.


Arc welding refers to a group of processes that use a power supply to create an electric arc between an electrode and the base material to melt the metals at the welding point.


The process of manual arc welding is widely used because of its easy manipulation and its low capital and running costs, which also makes it ideal for use in ship and boat building. In arc welding, the voltage is directly related to the length of the arc and the current is related to the amount of heat input.


Constant current power supplies are most often used for


manual welding processes such as gas tungsten arc welding and shielded metal arc welding because they maintain a relatively constant current even as the voltage varies. That is important because, in manual welding, it can be difficult to hold the electrode perfectly steady and, as a result, the arc length and thus the voltage tends to fluctuate.


The marine surveyor should have an understanding of what happens when the arc is struck. The electrode must first touch the piece to be welded. The causes a short circuit and, when the electrode is lifted slightly from the work piece, an electric arc is formed. Intense heat is generated to a temperature of about 6,000 degrees centigrade - high enough to melt both the electrode wire and its coating.


The aim of this handy guide is not to transform the surveyor into a competent welder, but to give him/her a deeper understanding and appreciation of this vitally important activity.


Electric arc welding runs to 76 pages and is available in paperback at £25 or in eBook pdf format at £22. To purchase a copy go to https://bit.ly/2KlN5WM.


Shipowners P&I Club releases a series of four podcasts about preventing yacht electrical fires


Since 2014 the Club has experienced 17 yacht fire claims. Of these claims, it was established that 10 were directly a result of an electrical fault, and 1 indirectly. These claims have the potential to demand a high quantum, with one such claim currently sitting at just under US$ 3 million. It is not just the financial implications of these incidents as yachts suffering from fire or smoke damage deprive their owner use of their asset. This mini-series of four podcasts has been created to generate awareness surrounding the causes of yacht electrical fires and provide guidance from industry experts on how these incidents may be avoided.


The guests and speakers each have different specialisms within the yacht industry, such as flag State, underwriting, and surveying, bringing a variety of different perspectives and opinions to the discussions. Shipowners hopes that you find these podcasts informative and encourage further circulation of these materials to assist the common goal of mitigating incidents of this nature.


The podcasts can be heard at http://bit.ly/36PD3td.


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