Topics covering the permanent joining of metal or plastic
In many welding and cutting processes, gas is used as a source of energy, or to protect (shield) hot metal and electrodes from the atmosphere. Wherever gas is used, there is a need to control or monitor the amount that is used. In gas welding and cutting, it is the gas pressure that is controlled […]
Flow Meters for Shielding Gas Read More »
Shielding gases protect molten metal from the effects of the atmosphere, and provide a medium for the arc where current passes between the electrode and the base metal. This article discusses the properties of the shielding gas that make that possible. Function of a Shielding Gas During arc welding, oxygen and other atmospheric gases,
Shielding Gases for Arc Welding Read More »
Worm Tracks are often encountered in both self-shielded and gas shielded flux core arc welding (FCAW). They are caused by gas that has come out of the solidifying weld but has been trapped under the slag. Worm Tracks are also called: Elongated Porosity (AWS A3.0 2010) Gas marks Chicken Feet Chicken Tracks Elongated Porosity is
In manufacturing, TIG welding, also known as Gas Tungsten Arc Welding (GTAW), is known for its precision and high-quality welds. TIG welding produces clean, precise welds with minimal spatter, making it ideal for applications requiring aesthetically pleasing welds of exceptional quality. TIG welding is suitable, among other things, for: Stainless steels Aluminium and nickel
Tungstens – Don’t Just Pick A Colour Read More »
What is gas surge? Gas surge is a rush of gas from a TIG or MIG torch when the trigger is pulled. The initial rush can be several times the required flow rate, before settles down to the value set by the flow meter. The consequences of gas surge There are three issues that
Shielding Gas Surge Read More »
Arc welding is a form of fusion welding where the heat needed to fuse the metal is created by an electric arc contained in a plasma of positive and negatively charged particles. The polarity of the voltage that sustains the arc has a significant effect on: Arc stability The amount of spatter generated Depth of
When Gas Tungsten Arc Welding (GTAW) oxide-forming materials such as aluminium and magnesium, DCEN for penetration and DCEP for its cleaning action can be used together. This is referred to as Alternating Current (AC) welding. Figure 1 (a). Representation of a sinusoidal voltage Figure 1 (b). Representation of a square wave voltage In both the
