This article discuss of how to weld copper pipe by brazing techniques. Brazing is a technique of splicing by using a filler metal between the two surfaces to be spliced . Applications brazing more difficult because it requires a higher melting temperature so that it takes the torch flame that is hotter and stable. Brazing strength is higher than soldering. Welding wire is found in the market brazing dash sold in stores ac spare parts. Brazing welding wire uses rod-shaped copper colored yellowish.
Materials copper pipe that will be connected heated to a certain temperature / copper will smolder but still below the point liquid. Then fillers hot until capillary melting and seeping automatically fill the space between the two copper pipes that will be continued. This filler will melt at temperatures around 760 ° C - 870 ° C. The welding process can be done manually or automatically. Filler metal is added to the weld area by feeding a plain wire. This welding technique is similar to the oxy-fuel gas welding process or ÖAW, but the GTAW arc and weld crater protected from the influence of air by a blanket of inert gas, usually argon, helium, or a mixture of both. Inert gas ejected from the torch and the areas around the tungsten electrode. While, how to weld copper pipe by GATW process is little different from brazing techniques. Welds with GTAW process has a smooth surface, no slag and low hydrogen content.
The other type is pulsed GTAW process, i.e. with a power source that produces pulsation welding current. These results in penetration and control of weld craters better, especially for root pass welding. GTAW can be done in an automated way. This process automatically takes power source and control programs, systems and wire feeder machine motion guides. This process has been applied to make the bulkhead weld on tube - to- tube-sheet weld and blunt the heat exchanger pipes. Butt weld on thicker pipes and big on power plants, is another success of automatic GTAW applications. Using automated GTAW wire feed, also known as TIG cold wire. Other types of automatic GTAW process called hot wire TIG. In hot wire TIG, welding wire gets hot prisoners from a low voltage AC current to increase the charging speed.
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