SMT machining. Wave soldering. Special nitrogen making machine for reflow welding industry. Nitrogen equipment. Nitrogen generator. Nitrogen machine. Nitrogen generator
Lead-free reflow welding equipment has put forward many new requirements, mainly including: higher heating capacity, no-load and load thermal stability, suitable for high temperature work materials, good thermal insulation, excellent temperature equalization, nitrogen leakage resistance, temperature curve flexibility, stronger cooling capacity and so on.
The need to use nitrogen in lead-free electronic assembly has the following principles
1, to meet the requirements of Europe, America and Japan and other customers;
2, using high temperature solder paste or solid, low activity (no cleaning, low residue) solder paste
3, brazing more expensive integrated circuit components, small volume components, fine-pitch components, flip chips and can not reverse repair components;
4, multiple plate assembly process or brazing PCB with OPS coating multiple re-flow;
5, brazing no protective film brazing pad or storage time longer circuit board or reliability first.
Because of the use of nitrogen, it is necessary to invest in the furnace to consider the amount of nitrogen consumed, the choice of nitrogen sources and the price of nitrogen, and it is more important to understand the latter. In fact, the use of special atmosphere inert nitrogen atmosphere in the welding process, can be used in the welding of the product will not produce defects in the welding process, can pass the test and acceptance, which saves the repair costs and labor costs caused by defects, but also saves the process time. Although the purchase of nitrogen atmosphere needs to spend a certain amount of money, it is much lower than the repair cost caused by welding defects.
Nitrogen reflow welding has the following advantages
1) Prevent and reduce oxidation;
2) Improve the welding wetting force and speed up the wetting speed;
3) Reduce the production of tin balls, avoid bridging, get a good welding quality, especially important, can use less active flux solder paste
4) It can also improve the performance of the solder joint and reduce the discoloration of the substrate.