While lead (Pb) managed to fill this role for most soldering applications, the phasing out of lead from products, as well as new requirements for increasingly more fine-pitched components have ...

Pull the solder away when enough of it melts to completely fill the joint. Once you're finished, turn the main supply valve ...

In the picture above are examples of tombstoning (C4), billboarding (R6), bridging (IC1), spattering (all over), solder balls (bottom right), and insufficient fill (IC2). In the lowest volumes ...