Soldering a male-female bus connector
So to summarize what I said in comments, the big manufacturers like TE and 3M make these in press-fit and "common" wave soldering version. 3M doesn't actually say much about the soldering process (at least in here, just "230°C for 60 seconds, 260°C for 10 seconds"), but TE goes in more detail besides specifying 260C and they recommend "Corpane Batch Vapor Phase (Model VVP 10 BU) and Vitronics IR (Model SMD 718) equipment", FWIW. As an aside, TE also sells presses (both manual and pneumatic) for their press-fit variants.

Teka makes a "self-soldering" version of these for reflow, which comes with solder balls pre-attached, and they have a more detailed article in which they compare their innovation with the alternatives. They recommended


  Since both the solder and flux (in the form of the solder clip) and the connector are placed on the PCB at the same time, all that is required for reflow is the application of localized heat. This can be accomplished with the use of a benchtop hot-air fountain such as the one produced by
  Zephyrtronics. (Pomona CA, http://www.zeph.com/pc104)