Most fluxes will bubble and switch light brown whenever they have reached the correct temperature. Drag the rod or wire of solder materials above the join, continuing to heat the realm indirectly from the other aspect from the steel, or a close-by surface. Established via the GDPR Cookie Consent plugin, https://auto-body-repair-estimate61593.ourcodeblog.com/27405225/helping-the-others-realize-the-advantages-of-types-of-solder-to-use-on-aluminum-radiator