The solder that do not have lead solders with solder having lead the comparison of temperature
Spot welding of solder alloy frit receives temperature
℃ of Sn63Pb37183 ℃ 240-250
℃ of Sn96.5Ag3.0Cu0.5217 ℃ 250-260
The content of the Sn in the solder that do not have lead is a lot of higher than having plumbic solder, because this does not have plumbic solder to oxidize more easily, produce more stannic broken bits (SnO2) , much stannic residue affects the quality that solders without plumbic wave crest not only, and generated much waste.
Normally, the 3-4 that the solder that do not have lead is cost of solder having lead times. Assume factory a day of 3 generation 15-30 kilogram broken bits of stannum of the solder that do not have lead, this cost may achieve RMB 3600-7200 yuan / day, it is 100-200 a year 10 thousand RMBs.
Where is a large number of costly stannum broken bits in how decreasing to will solder without plumbic wave crest henceforth? Among them an effective method solders in wave crest namely one introduces in the technology " channel type whole journey fills nitrogen to protect a technology " . It is namely in craft of wave crest solder, include to grow long warm-up area and area of wave crest solder to use the channel protection that close to rise fill nitrogen. In the chroma that contain oxygen very low environment falls undertake soldering.
In channel type environment full nitrogen falls, the generation rate of stannic broken bits fell to make an appointment with 80 ％ left and right sides, such a year economic can achieve 80-160 at most 10 thousand RMBs.
