Copper is used for various applications and is widely used. This makes joining copper sheet a common processing technique. The following instructions are intended to help you solder a copper sheet professionally.
Joining copper and copper alloys
Copper is one of the few metals that are often used unalloyed. In addition, there are also numerous copper alloys such as the various bronzes (tin bronze, gunmetal, aluminum bronze, nickel silver, etc.). Also brass. You can join copper and copper alloys in different ways:
- Also read - Processing copper sheet
- Also Read - Cleaning A Copper Sheet
- Read also - Painting a sheet of copper
- soft solder
The welding of copper sheets
However, the welding of pure copper sheet is problematic. Just like welding bronze alloys that contain lead. However, soldering is all the easier for this.
Here you must first differentiate between hard and soft soldering. Soft soldering takes place up to 450 degrees, from 450 to 1.200 degrees is hard soldering, with high temperature soldering (HTL) being used from 900 degrees.
Prepare the copper sheet before soldering
Whether you are using hard or soft soldering - the copper sheet must first be prepared. You can remove any oxidation layer by grinding or brushing the copper.
Make sure that you have not worked on any other metals with the sandpaper. Also pay attention to the copper or brass wire with the brush trimmings. After removing the oxide layer, the copper sheet has to be degreased. You can use ordinary ethanol alcohol (spirit) for this.
Join the copper sheets optimally
You have to use the capillary effect when soldering. For this purpose, the gap between the two copper sheets to be soldered must not be greater than 0.2 mm. Otherwise it will not draw the solder optimally into the gap and the solder seam will not be able to withstand high loads.
Hard or soft soldering of copper sheet
For brazing, use a sufficient blowtorch (€ 24.90 at Amazon *) and the appropriate silver solder with flux. You have to choose the temperature (600 to 900 degrees) which is good, as the more you heat the copper the more it reacts strongly thermally.
Soft soldering and soldering in the food sector (drinking water)
Tin-lead or lead-tin solders with the appropriate flux are mainly used for soft soldering. These have a working range of around 250 degrees. However, you must bear in mind that lead-containing solders must not be used for copper sheets or pipes in the food sector. Quite a few water pipes are made of copper. Then use pure tin as a solder.Tips & Tricks In addition, the temperature development often plays an important role here as well. If the temperature is to be kept as low as possible, there are also solders for soft soldering, which can be used from around 150 degrees.