Gold plated steel pad welding onto alumina frame

Hello, we are glad to inform you that we accept your recommendation regarding welding a gold plated metal plate onto the alumina frame. Also, thanks for your samples; they performed extremely well in the Radio Frequency (RF) test.

This is truly a wonderful moment for our engineers who have been dedicated to the process study through a matrix of hundreds of parameters. Meanwhile, production engineers are well aware of the challenges they will encounter, even though they are experienced in turning what seems impossible into realizable outcomes.

A special jig has been made to pull the golden plate. By gradually increasing the force and conducting a normal distribution analysis, we aimed to figure out the nominal pulling force. This nominal pulling force indicates how robustly the golden plate can be adhered to the alumina surface.

The melting temperatures of the steel plate and alumina are quite distinct. A high - energy spot laser beam is adopted to fulfill this welding task. Determining the suitable laser parameters is the key to ensuring welding quality, including aspects like the bonding force and minimizing the melting spot.

Hundreds of samples were discarded during this intensive trial, all in an effort to find the optimal matrix of laser power, laser spot diameter, laser frequency, and so on.

The RF test is also carried out as it serves as a crucial gate for quality assurance when the components are used in electronic devices.

At the ramp - up stage, 10% of RF test defects were reported. Hundreds of non - conforming parts were placed on the engineers' tables. They conducted mechanical dimension checks one by one and investigated each process in great detail. However, the real problem was like a ghost, constantly hiding.

Some Non Good parts were occasionally subjected to heavy cleaning, which was actually similar to polishing the contact pad. And surprisingly, they suddenly became good parts. How did this happen? Through microscope surveys, it was found that there were some non conductive substances adhered to the golden pad surface. These substances originated from the laser process; some oxides were created due to the laser’s high temperature. Even though there was a cleaning process after laser welding, some oxides still remained and were almost invisible to the naked eye.

Soon, a 10% yield improvement was achieved by applying double solvent cleaning on the contact pad.