Lead-free environmentally friendly solder wire, with alloys including SAC305, SACX0307, and SN99.3CU0.7. The SAC305 alloy has excellent welding quality with a 3% silver content. The SACX0307 alloy is compared with the SAC305 alloy, which has a lower cost and excellent welding performance with 0.3% silver content. The SN99.3CU0.7 alloy is a tin-copper composition without silver.