Development of Copper Tube Brazing Process for Air Condition Refrigerant System Using Rotation Table

Abstract

The objectives of this research are to develop the welding process of copper tube for refrigeration in air conditioner by using rotation brazing table. The key design is the use of rotary head for nitrogen and rotary head for cooling water in assembly jig, nitrogen discharge to prevent the internal welding soot, to remove the soot that may occur during welding from piping system and to cool down the profile quickly. The result of water cooling to prevent that damage due to the heat of welding. The result from designing and creating of rotation brazing table to substitute stationary welding found that there is the reduction of machine cost by 11.61% or 46,000 Baht/machine, reduction of usage space 8.75 square meters or 74,375 Baht, increase of productivity by 93.48%, reduction of nitrogen consumption by 98.20% or 2,593 Baht/month, reduction of support tool in production 75,000 Baht per one rotation brazing table, reduction of tiredness from working by 30.24% or equal to 137 manual works per day and reduction of usage of consumable material that can cause of greenhouse gas in form of trash such as cloth glove 1.40 KgCo2 per year, leather glove 12.5216 KgCo2 per year, nitrogen gas 0.1784 TonCo2 per year and water 0.54 KgCo2 per year. All of these can support the competition and dynamic change of industrial air conditioner in the future sustainably.