Joel is R&D resurcher in Singapore corporation. = researcher
He asked me about molten solder's behavior in funace. = furnace

I answered the question.

Please check the e-mail contents below.

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Dear Joel. = Joel,

Thank you for asking your problems. = Thank you for your inquiries. 

I would like to write // additional answer about a question // yesterday. = an ; you brought up

If you saw Ni(or solder of high Ni concentrations) on // surface of melted master alloy, // Raw material(Ni) had not // dissolved in the master alloy. = the ; the raw ; been

To solve this problem.. = To solve this problem, do the following:
When you make master alloy for Welco Process, you must produce a master alloy in appropriate conditions such as temperature, stirring, // heating time. = and
(Example : maintain 20min at 800’C in induction furnace.)
It’s difficult to dissolve raw material of Ni. Because melting temperature of Ni is higher than Sn, Ag, Sb, Cu and Bi = because its melting temperature is
If you use completely dissolved master alloy, I think you will be able to solve the problem.

Please let me know by e-mail if you have any questions.

Best regards.
David Park.