6061 aluminum tube in use may need to be welded, that welding may find some problems, the next 6061 aluminum tube manufacturer will introduce to you, 6061 aluminum tube welding may appear problems.

1. Easy to oxidize

6061 aluminum tubes have a strong affinity for oxygen.At room temperature, the surface of 6061 aluminum tubes can be oxidized into a dense AL2O3 film with a thickness of about 0.1~0.2m.Although this layer of aluminum oxide film is relatively dense, can prevent the continued oxidation of metal, beneficial to natural corrosion, but it brings difficulties to welding, easy to form slag inclusion, and aluminum oxide film also adsorbed more water, welding will promote the formation of weld porosity.

2. High specific heat and thermal conductivity

The thermal conductivity of 6061 aluminum tube is good. Therefore, when welding 6061 aluminum tube, it will consume more heat than steel tube. Therefore, heat sources with different energy and power are needed.

3. Hydrogen pores are easy to form

The welding pores of 6061 aluminum tube are mainly hydrogen pores.6061 tubes can absorb a large amount of liquid dissolved hydrogen, with a solubility of 0.0069 ml/g in the molten state, and solidify at a high temperature of 0.00036 ml/g, after a nearly 20-fold difference.6061 aluminum tube welding accelerates the crystallization of metal materials. In the process of rapid cooling design of welding pool, the solubility of hydrogen increases and decreases sharply. At this time, a large amount of susaturation gas is precipitated in the enterprise, and hydrogen is too late to precipitate out and form a pore in the weld metal.

4. Easy to form thermal cracks

The crystalline shrinkage ratio of 6061 steel tubes is approximately doubled by the linear expansion coefficient, which tends to produce high welding deformation and stress, plus the adverse effects of certain impurities or alloying elements, in the fracture of more rigid joints as a result.

5. Burn through and collapse

6061 aluminum tube from solid to liquid, because there is no obvious color change, so it is not easy to judge the temperature of the molten pool.

About the 6061 aluminum tube welding may appear the problem is introduced here, if you need 6061 aluminum tube can contact us.