There must be a slight gap involving them for that solder to move along, but keep this to one/twenty five" (1 mm) or much less. If the parts will not in shape with each other effortlessly, you need to make the joined spots clean through sanding or bending. As pointed https://automotive-technology92978.blazingblog.com/27332330/what-does-types-of-solder-to-use-on-aluminum-radiator-mean