Sonikel Ultrasonics, finds effective solutions for the welding of The PV-Junction box which can work in the atrocious weather. The PV-Junction box is not only with the convenient installation of ribbon bands but also all connections are double strengthened connection. The maximal working current will be changed when the box is fixed with different types of diode. This photovoltaic junction box, needs to be welded very strongly so ultrasonic welding is prefferred. Sonikel Ultrasonic uses 20kHz - 2.000 Watt ultrasonic welding machine for this application. Solar Junction Box 4Rail with 3 Diodes is IP67 so ultrasonic sealing is very critical. The outer cover has the capacity of anti-aging and resistance to ultraviolet radiation. If the ultrasonic sealing is IP67, user will have a complete solution. Sonikel Ultrasonics, designs and manufactures titanium sonotrodes and steel sonotrodes for different applications.