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Lead-free Manufacturing
Lead-free soldering process requirements

By Carmen
Lead-free wire corresponding to the new hand welding tools required
  
1. Lead welding material impact on the environment:
As Pb is a toxic metal, harmful. And have great destructive to the natural environment.
2. Origin of lead-free soldering:
As the environmental protection requirements, especially ISO14000 import, most of the world countries have begun to prohibit the use of lead soldering material ingredients.
Japan in 2004, banning the production or sale of materials, use of lead soldering of electronic production equipment. Europe and the United States in 2006 to prohibit the production or sale of materials, use of lead soldering of electronic production equipment. It is estimated that China did not take long will also use lead-free soldering.
Therefore, in this case, the electronic material began producing lead-free solder. For example: the United States Alpha metal Wire: reliacore 15 The major components of the S nAgCu.
3. Schematic diagram of the oxidation rate of wire properties
 assumptions:
A. Wire at room temperature the oxidation rate of 24 value = 5.
B. Wire in the other temperature oxidation rate of the value of = the temperature of oxidation rate / 24 room temperature oxidation rate of 5.
Description: The solder composition is different from its oxidation rate is different. If you need more information about the oxidation of the solder properties, please contact the vendor of your company
4. Leaded and lead-free welding wire the difference between:
1: Composition differences
 Universal 6337 the composition of welding wire as follows: 63% Sn; 37% of the Pb.
 lead-free wire of the main components (Alpha metal of reliacore 15 a SnAgCu, for example): 96.5% Sn; 3.0% Ag; 0.5% Cu




2: Melting and welding temperature:
Temperature
Types of welding wire melting temperature
6337 wire 183 350
Lead wire 220 390
5. The use of lead-free wire, the use of existing welding station will be the impact (in HAKKO936 / WES51 as an example)
Temperature
Types of welding wire melting temperature of welding speed
6337 wire 183 350 approximately 4 seconds / month
Lead wire 220 390 approximately 6 seconds / month
 cause problems
A. Severe oxidation of solder joints, resulting in conductive poor solder joints off, solder does not gloss quality.
B. Decline in factory production.
6. Weller @, Hakko @, Metcal @ and other major manufacturers of welding station solutions
A. Hakko solution: (on behalf of Product: Hakko931; Hakko941)
 improve welding station's power: from 60W to 100W
 improve thermal conductivity pen welding: welding pen to change the structure of the iron head and the heat made the whole body.
Disadvantages: As the iron head and the heating body as a whole, thus enabling users to huge increases in the cost of there. HAKKO931 tip of the price of 360 yuan / month
B. Metcal solution: (on behalf of Product: MX500; SP200)
 improve welding station's power: from 60W to 100W
 improve thermal conductivity pen welding: welding pen to change the structure of the iron head and the heat made the whole body.
Disadvantages: As the iron head and the heating body as a whole, thus enabling users to huge increases in the cost of there. Metcal tip of the selling price was 160 yuan / month
C. Weller solution: (on behalf of Product: WS81; WSD81)
 improve welding station's power: from 50W to 80W
 improve thermal conductivity of solder pen: to change the thermal conductivity of material. Changed by the general precious metals alloys, which greatly improve the thermal conductivity.
Advantages would not increase the user's use of cost
7. Controversy: the use of welding sets, do we need to protect and provide nitrogen preheating:
Based on personal views, not required to provide protection and the provision of warm nitrogen.
Because the use of new welding station, the time required for each solder joint generally only 3 seconds, it has reached and exceeded the standard leaded soldering process, therefore, do not need to
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