Argon shielding gas tungsten arc welding electrodes (TIG - TIG welding)

Argon shielding gas in TIG welding of the tungsten electrode and argon arc drawn between the primary gázburok surrounded. The gázburok efficacy is highly dependent on gas density and welding speed. The welding speed is increased, it may exit the arc védőgázburokból.

The burning argon arc burning in air is different in many ways ívtől. The monatomic gases argon, in which the electron mobility is much larger than the diatomic gases. In addition to this fundamental difference is another distinctive difference is that the arc of a very high-melting tungsten electrode and a relatively low melting point metal of heaven. In particular, the large melting point difference between the two eg. aluminum welding.

In the case of two very different melting point material is formed between the arc, the anode and cathode due to a significant difference between the temperature. The foregoing has been seen that two of the same material of the anode electrode is drawn between the arc temperature is usually slightly higher because of the high-speed collision of electrons, the effect develops more heat. This effect gradually argonív case prevails, because the electrons in the argonívben much higher speed.

The temperature depends largely on whether straight or reverse polarity switching will be used. Straight polarity of the tungsten electrode is switched to negative, the positive material to be welded corner (2.52 / a. Figure). In this case, the electrodes in katódfoltból start from very high-speed electrons, which are connected to the anode face composites, which are relatively narrow area, but very very hot. The seam is thus formed is narrow but very deep. The argon shielding gas in this case only role.

Reverse polarity switching (2.52 / b. Figure), when the materials to be welded to the negative pole, high-speed electrons in the tungsten electrode to fuss, and developed into colliding with high heat. As a result, sell more copies of the tungsten electrode, which is thicker and using water-cooled electrode can be prevented. A reverse polarity connection has the advantage that the high-density, high volume argon ions collide with the surface of the object, and there is potential in the oxide and nitridhártyát evaporator. In this case, the protective effect of argon only, but also has a purifying effect. This phenomenon is particularly important in the case of metals, which can be easily formed on the surface oxide (eg aluminum and magnesium). The benefits of different polarity switching AC welding can occur. Here is the straight and reverse polarity alternating with periods of alternating current.

Argonívhegesztő the equipment are made in two versions: AC transformer or DC dynamo. Argonívhegesztő the equipment the following elements: pipes (A), power (B), high frequency power generating system (C), gas (D), gázsebességmérő (E), cylinder (F), and heavy-duty torches for the cooling water (G)

Welding argon purity is very important. Empirical data show that 99.8% purity argon achieved good results. 0.2% impurity in the argon to nitrogen only, argon, oxygen or water vapor can not contain. Since the commercially available argon does not always reach the required purity of argon in the work should be cleaned before use.

The TIG welding is one prerequisite for the success of the welding location and hegesztőanyagainak careful cleaning of all dirt.