The reason why the soldering iron head is not on the tin has many factors, there are the following situations may lead to not on the tin:

1, uneven plating, affecting heat conduction

2、Soldering temperature is low

3, the end of the welding work is not on the new tin for protection, plating oxides affect the next tin

4, the use of poor-quality materials produced by the soldering iron tip will also affect the tin

Corresponding treatment is as follows:

1、Improve the consistency of the plating

2、If conditions permit, increase the soldering temperature

3、After the soldering operation, put new tin to prevent oxidation.

4、Use high purity, fast heat conduction material.