| I am looking at purchaseing a full convection bench top oven from OK Industrys. (Model JEM-310) | It seems to have all the features that we will need for low volume production runs. | It has a Nitrogen input option, and I am intrested if anyone on the forum can tell me what the advantage of using nitrogen is in a reflow oven. What is it doing to the process? | I heard that it helps form a more even temprature inside the oven, is this true? I was thinking that it would avoide oxidiation, but cannot find any information about this. | I would be greatfull for any information anyone can tell me about this. | Also, I would be intrested in knowing what people think of this oven, if there ay any owners out there. | Cheers, | Grant Petty | Digital Voodoo. Grant, If there is a big cost difference between including the nitrogen option on a new machine, and retrofitting the capability later, it might be wise to consider the Nitrogen option. Nitrogen is a must for Wave Solder, and thus many shops already have a nitrogen system in plant. If you are involved with fairly complex assemblies. The trend in the SMT industry is to move to less active flux chemistries. The initial no-clean fluxes requirred the use of nitrogen, but have come up to the point that nitrogen is no longer necessary. Having Nitrogen capability will open your process window a bit, and if solderability on particular components or assemblies are questionable, the capability can make a difference. Plus may aid if a drop in solder paste activity is needed down the road. BGA, flip chip, and related technologies are best used in nitrogen. There is no direct upward path for outgassing to excape, and thus voids can be created. Nitrogen will reduce oxidation, and thus limit the amount of outgassing. If have no plans of moving to a low activity paste, have a good control on your materials, and plan to stay away from more complex assemblies, you may not need the advantages associated with Nitrogen reflow.
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