Reducing dross method of lead-free solder
AssigneeGuangzhou Solderwell Enterprise Co., Ltd.
InventorsKun Du, Minghan Chen, Xin Chen, Liesong Cai
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Abstract
A reducing dross method of lead-free solder includes the steps of: producing master alloy of reducing dross which comprises Sn and 0.1 to 0.8 wt % P; analyzing the percentage of P of the lead-free solder to be modified, in order to reach 0.008 to 0.015 wt % P in the lead-free solder, adding the master alloy into the lead-free solder with the percentage of P less than 0.008 wt % or no P; then sampling the lead-free solder at regular intervals to determine the percentage and the percentage loss of P, if the percentage of P being less than a given value from 0.008 to 0.015 wt %, adding the master alloy to keep the percentage of P as 0.008 to 0.015 wt %.
Claims9
A reducing dross method of lead-free solder, comprising the steps of:
- firstly producing alloy of reducing dross by a master alloy process, the alloy of reducing dross comprising Sn and 0.1 to 0.8 wt % P;
- analyzing a percentage of P of the lead-free solder to be modified in a soldering furnace;
- if the percentage of P of the lead-free solder is less than 0.008 wt %, adding the alloy of reducing dross into the lead-free solder until the percentage of P of the lead-free solder in the soldering furnace reaches within 0.008 to 0.015 wt % P;
- then sampling the lead-free solder in the soldering furnace at regular intervals to determine the percentage and a percentage loss of P of the lead-free solder in the soldering furnace;
- if the percentage of P of the lead-free solder in the soldering furnace is less than 0.008 wt %, adding the alloy of reducing dross calculated according to the percentage loss of P in an amount needed for maintaining the percentage of P of the lead-free solder as 0.008 to 0.015 wt %.
Dependencies are inferred from the claim text.