DC reverse polarity is not generally used because it produces shallow and wide welds. AC arc is used for welding aluminum, magnesium, cast UAE Mobile Number Database iron and a number of other metals. Penetration with AC arc is midway UAE Mobile Number Database between the penetration produced by DC direct polarity and DC reverse polarity. TIG Welding UAE Mobile Number Database Process: A high frequency, high voltage (100 kHz to 2 MHz, 2000 volts) low amperage current supply is often used in TIG welding to initiate the arc. This is to avoid UAE Mobile Number Database the contamination of the electrode caused when the arc is initiated by short circuiting with the work piece.
When electrode tip reaches within a distance of 3 to 2 mm UAE Mobile Number Database from the job, a spark jumps across the air gap between the electrode and the job. The air path gets ionized and arc is established. The superimposed UAE Mobile Number Database high frequency current causes a spark to jump the gap between the electrode and the work piece. If a high frequency source is not available the arc can be initiated by scratch UAE Mobile Number Database starting using copper striker plate to limit electrode contamination.
These process and Welding and Cutting Equipment's are followed majorly in around the welding industry throughout the globe. Ref:marinenoteswelding-gtaw-welding-arc-welding.HTML Beauty net is a online beauty store where we UAE Mobile Number Database offer you all kinds beauty products in a big range of variety. All kinds beauty materials are available under one roof we are offering you best quality genuine things and we are a certified UAE Mobile Number Database company who offers beauty materials we are not saying we offer you cheap items we are offering you quality beauty items. We have all variety of items for UAE Mobile Number Database men's and women's and kids we are not limited in one particular area we are selling our globally. Because we are available every country with ouBeauty net is a online beauty store where we offer you all kinds beauty products in a big range of variety.