We designed and produced loads of bespoke weathervanes in the run up to Christmas, so thought we’d write a post showing the process involved in welding the sail. Firstly the bar is cut to size for the weathervane sail and cleaned with the angle grinder, removing any mildscale and dirt that could contaminate the weld. The customer had chosen the Celtic arrow, so this is clamped to the bench along with the bar, making sure they are straight and in line with each other.Once TIG welded on all four sides, the arrow and bar can be left to cool, which in our freezing cold workshop does not take long in December! The Irish Terrier profile is cleaned to remove any burrs from the cutting process, as is the top of the bar where the profile will be welded. This is then clamped tightly to the bench to ensure it is straight; if it’s leaning to one side the wind will catch the sail & just spin continuously rather than pointing into the wind as it should. Both sides of this are TIG welded.Once cool, we need to find the balance point on the weathervane sail. Because the arrow is cut from much thicker steel than the Irish Terrier profile, this point is usually somewhere in the centre, though it’s important to be precise or the weathervane won’t function correctly. This point is marked with chalk, and the mildscale cleaned off.A length of tube is now cut to size, and both ends cleaned to remove burrs and any grease or dirt, and finally a light sanding smooths off any grinder marks.The tube needs to be welded on at exactly 90 degrees, so we use a magnet to hold this angle while it is tacked in place. A set square is used to keep checking the angle as metal has an annoying tendency to pull one way or another as it heats and cools! It also needs to be straight in the other direction so it’s in line with the Irish Terrier profile, otherwise it would lean to one side when mounted & therefore not catch the wind properly. The photo below shows the weathervane sail welded completely, and ready to be zinc electroplated & powdercoated with whichever fixing and letter bar option the customer has chosen.