Do solder joints have to be shiny?
A good solder joint should be shiny and fill but not overflow the pad. Here are some indications of a bad solder joint: The pad and lead aren’t completely covered with solder, enabling you to see through one side of the hole through which the lead passes.
How do you make solder shiny?
Here’s How You Get Shiny Copper Patina
- After soldering, clean your piece with patina and flux remover.
- When the piece is dry, mix a solution of 3 parts distilled water and 1 part ammonia.
- Dry the piece with a paper towel.
- Dip a paper towel into the patina and rub it all over the piece to cover the solder lines.
Are dull solder joints bad?
Dull or grainy joints are not a big concern – the grain structure will grow in a joint over time anyway.
How can you tell which joint solder is cold?
Cold solder joints can be detected by visual checking or using a magnifying glass. Primarily, a cold solder joint could look dull, whitish, and convex, or deformed, which is very different from a proper solder joint. Another way to detect a cold solder joint is by using a Multimeter.
Why are the solder joints on my car so dull?
Dull (non-shiny) solder joints are usually the effect of coarse grain structure in the solid solder joint (though there can be other causes). The more slowly a joint cools, the coarser the grain growth and, conversely, the faster the joint cools, the finer the grain growth and the shinier the joint.
How can you tell if a solder joint is dry?
Unlike good solder joints that are shiny, dry joints have a dull or matt finish. Also when soldering them they appear to have a more granular appearance as the solder is melted. When a dry joint is found, the solder on the joint should be removed and care taken when re-soldering it to ensure that a good joint is made.
What happens to the grain in a solder joint?
The more slowly a joint cools, the coarser the grain growth and, conversely, the faster the joint cools, the finer the grain growth and the shinier the joint. Dull or grainy joints are not a big concern – the grain structure will grow in a joint over time anyway.
Is it OK to use solder iron on dull joints?
Dull or grainy joints are not a big concern – the grain structure will grow in a joint over time anyway. But having a dull joint is giving this eventuality a “head start”. However, under no circumstances, should a joint be touched up by applying a soldering iron (or other means) simply for the cosmetics of a shinier joint.