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Characteristics and lead to health hazards: lead (lead Pb), gray metal, a melting point of 327.5 ℃, heated to 400--500 ℃ when a large number of lead that is escaping steam, ethylene oxide and quickly oxidized in air lead and aggregation of dust and four escape. In the industrial sector in contact with lead are mainly lead mining, refining and lead rope burn, battery manufacturing, electronic products and electronic components of the welding work lead spray and so on. Lead and its compounds in the above contacts, mainly through the respiratory and digestive tract produce lead poisoning caused by invasion of the body, constitute a hazard to human health. EPA study found that lead and its compounds are one of the serious harm to human life and the natural environment of the 17 kinds of chemical substances. Occupational lead poisoning is usually chronic poisoning, the human nervous system, blood and digestive system will cause interference and damage, which provides temporary symptoms of dizziness, headache, fatigue, memory loss, nausea, irritability, loss of appetite of appetite, abdominal pain, anemia, mental disorders.
To remove lead-free solder and no special requirements. Compared to remove the traditional solder, removal of lead-free solder is only required a longer period of time in addition to tin.
Removal of lead-free solder, it should be used with the past to remove the traditional solder temperature, do not have to improve, because the high temperature will accelerate oxidation, shorten the nozzle life.
When using vacuum suction tin gun, not only the ceiling nozzle and the heating core is required to maintain a stable temperature and filter entry also need enough temperature to avoid blockage of the solder. White FM-2024 gun can effectively avoid the occurrence of this problem.
I. high temperature welding will destroy some of the electronic components, including plastic connectors, relays, light-emitting diodes, electrolytic capacitors and multilayer ceramic capacitors
Ii. high temperature will cause the circuit board to bend, resulting in multilayer ceramic capacitor damage (common damage)
III. high temperature welding will cause thermal shock to the components
IV. high temperature will make the plastic components dissolved or deformed
V. high temperature welding will accelerate oxidation, affect the diffusion and wettability of solder
Vi. need to use high activity (corrosive) flux
Vii. to provide more heat and welding for a long time before they can achieve the desired effect of welding
Viii. is easy to produce tin bridge and weld, and not easy to modify
IX. is easy to produce solder and flux scattering
X. shortened solder nozzle life
Xi. solder joint color will be more bleak
Xii. operators will not meet, worry about whether the need to change the welding mode
In the lead-free solder lead-free, and the melting point than the traditional (63% Sn + 37% Pb) solder high.
Commonly used lead-free solder:
"Sn-Ag (Sn + Ag, 96-98% tin)
"Sn-Cu (tin and copper, 96% tin)
"Sn-Ag-Cu (Sn + Ag + Cu, 93-96% Sn)
"Sn-Ag-Bi (Ag + Sn + Bi, 90.5-94% tin)
"Sn-Ag-Bi-Cu (Ag + Sn + Bi + Cu, 90-94% Sn)
63/37 lead solder melting point of 183 ℃, freezing point the same as the 183 ℃. Note: This does not appear Solder colloidal [same cooling from liquid to solid (or vice versa) temperature points].
60/40 lead solder melting point of 191 ℃, the freezing point of 183 ℃. Note: This solder has a range of 8 ℃ form a colloidal [cooling from liquid to solid (or vice versa) the desired temperature range].
Lead-free solder melting point range from 217 ℃ to 226 ℃.