Why the
[url=http://www.aluminium-sheet.com][url=http://www.aluminium-sheet.com]aluminum sheet[/url][/url] crack after?Maybe the crack existed during welding but you didn’t notice. And then it expands and becomes obvious when acted on by external force in circling process. The reason may be the welding craft. Besides, I suggest more comprehensive tests after welding, such as penetrant test.What I want to add is to choose such welding wires as 5383 or 5183 wire whose magnesium content is higher than 5754 wire. The loss of magnesium due to high temperature in welding process may reduce the intensity of welding area.It is either because of wrong filling material for welding or bad welding quality. It doesn’t crack after welding, but cracks when the increasing tension in circling process exceeds the internal stress of the weld.Other related question