{"id":10712,"date":"2024-09-13T16:54:52","date_gmt":"2024-09-13T08:54:52","guid":{"rendered":"https:\/\/www.ray-tron.com\/?p=10712"},"modified":"2024-09-13T16:54:52","modified_gmt":"2024-09-13T08:54:52","slug":"ale0053","status":"publish","type":"post","link":"https:\/\/www.ray-tron.com\/en\/ale0053\/","title":{"rendered":"How to make high-quality photovoltaic welding ribbons, photovoltaic welding ribbon production process"},"content":{"rendered":"

Photovoltaic welding ribbon<\/a>The production process is a precise and strictly controlled process, which includes multiple steps from the selection of raw materials to the packaging of finished products. The following are the main process flows of photovoltaic ribbon production:<\/p>\n

1. Raw material preparation<\/strong><\/p>\n

The base material of photovoltaic welding strips is generally high-purity oxygen-free copper, so first of all, you need to prepare high-quality copper materials. The purity of copper materials directly affects the conductivity and mechanical properties of the welding strips, so electrolytic oxygen-free copper or low-oxygen copper is selected as the production base material.<\/p>\n

2. Copper wire stretching<\/strong><\/p>\n

The thick copper wire is gradually stretched to the required size through multiple drawing processes until it reaches the required size of the photovoltaic ribbon. The thickness and width of the copper wire are controlled during the drawing process to ensure the specification accuracy of the final product.<\/p>\n

The wire drawing machine is used to stretch the copper wire to the desired thickness. The copper wire passes through multiple dies to gradually reduce its diameter to the final desired size. This step must be strictly controlled to ensure that the diameter of the copper wire after stretching is uniform.<\/p>\n

3. Annealing process<\/strong><\/p>\n

During the stretching process, the copper wire will become hard due to the force and lose some of its ductility. In order to restore its flexibility and improve the subsequent welding performance, the stretched copper wire needs to be annealed.<\/p>\n

The annealing furnace is used to heat the copper wire to a certain temperature and then slowly cool it to restore its softness. The control of the annealing process determines the mechanical strength and flexibility of the soldering ribbon.<\/p>\n

4. Rolling forming<\/strong><\/p>\n

The annealed copper wire needs to be further rolled to a specific thickness and width. Through the rolling process, a uniform copper strip can be obtained, and the width and thickness strictly follow the technical requirements of photovoltaic welding strips.<\/p>\n

The rolling mill equipment presses the copper wire into a flat strip, controlling its final thickness and width to meet the specification requirements. This process requires precise control of the rolling force and speed to ensure the stability of the strip size.<\/p>\n

5. Cleaning and surface treatment<\/strong><\/p>\n

After rolling, there will be some oil, oxide layer or impurities on the surface of the copper strip, which will affect the subsequent tinning process. Therefore, the copper strip needs to be cleaned and surface treated.<\/p>\n

The pickling process is often used to remove surface oxides to ensure the cleanliness of the copper strip.<\/p>\n

The cleaning equipment uses cleaning fluid to clean the copper strip to remove residual stains and impurities.<\/p>\n

6. Tinning<\/strong><\/p>\n

Tin plating is a critical step in the production of photovoltaic ribbons. By plating a uniform layer of tin on the surface of the copper ribbon, the welding performance is enhanced and the copper material is prevented from oxidation. The uniformity and thickness of the tin plating directly affect the welding effect of the ribbon.<\/p>\n

Hot dip tinning or electroplating tinning process: The tinning method can be hot dip tinning or electroplating tinning. Hot dip tinning is to immerse the copper strip in molten tin liquid for tinning, while electroplating tinning is to evenly coat the surface of the copper strip with tin through electrochemical reaction. The thickness of the tinned layer is generally between 20-30 microns and needs to be strictly controlled.<\/p>\n

7. Cooling and winding<\/strong><\/p>\n

After tinning, the solder strip needs to be cooled quickly to fix the tin layer and ensure its smoothness and adhesion. After cooling, the solder strip will be neatly wound into a disk for subsequent processing and transportation.<\/p>\n

The cooling system quickly cools the tinned solder strip to prevent deformation or defects in the tinned layer.<\/p>\n

The coiler rolls the cooled solder strip into a specified length, and the finished solder strips of different lengths are usually customized according to customer needs.<\/p>\n

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