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What are the factors influencing welding machine for welding aluminum alloy?
by：ZORON Machinery
2021-01-29
Due to the high reflectivity and high thermal conductivity aluminum alloy, to inducing the formation of holes will need to have a higher energy density.
Due to the energy density threshold of essentially controlled by the composition of alloy, so can by controlling process parameters, choosing power to ensure the right amount of heat input, to obtain a stable welding process.
In addition, the energy density threshold value to some extent also affected by the protective gas species.
When, for example, automatic welding machine for welding aluminum alloy using N2 gas can be more easily induce holes, and the use of He gas can't induce holes.
This is because the N2 and Al can occur between exothermic reaction, Al - generated
N -
O ternary compound can improve the absorption rate.
a, crack problems
aluminum alloy belongs to the typical eutectic alloy, the welding rapid solidification under more prone to hot cracking, weld metal crystallization in AL - on the boundary of the columnar crystal formation Si or Mg Si and other low melting eutectic is the cause of the crack. To reduce the hot crack, can use methods such as wire filling or preset alloy powder welding. By adjusting the waveform, can also reduce crystallization crack control heat input.
2, stomatal problem
aluminum alloy of different kinds of stomatal type is also different. It is generally believed that aluminum alloy produced the following categories in the process of welding porosity.
1, the protective gas pores. In high energy in the process of automatic welding machine for welding aluminum alloy, because of the strong evaporation molten metal at the forefront of the bottom hole, make the protective gas were involved in the molten pool formed bubbles and when bubbles to escape and residual becomes a hole in the solid aluminum alloy.
2, hole collapse of pores. In the process of welding, when the surface tension is greater than the vapor pressure, the holes will not be able to maintain stable and collapse, metal to fill the holes are formed. To reduce or eliminate blowhole defects in aluminum alloy welding also has a lot of practical measures, such as adjusting the power waveform, reduce holes unstable collapse, change focus beam height and tilt illuminate, applying the electromagnetic field and in the welding process in vacuum welding, etc. Emerged in recent years, with wire filling or preset alloy powder, composite heat source and double focus of technology to reduce the porosity, has a good effect.
3, hydrogen vent. Aluminium alloy after melting in a hydrogen environment, its internal hydrogen content can reach 0. More than 69 ml / 100 g. But after solidification, the equilibrium condition of dissolved hydrogen capacity is only 0. 036 ml / 100 g, both differ nearly 20 times. Therefore, in the process of from the liquid to solid, liquid aluminum in excess hydrogen is bound to precipitate. If exhalation hydrogen can't well floatation escape, gather integration bubbles to remain in solid aluminum alloy become porosity.
we want more welding machine price, welcome to inquire, hotline:
a, crack problems
aluminum alloy belongs to the typical eutectic alloy, the welding rapid solidification under more prone to hot cracking, weld metal crystallization in AL - on the boundary of the columnar crystal formation Si or Mg Si and other low melting eutectic is the cause of the crack. To reduce the hot crack, can use methods such as wire filling or preset alloy powder welding. By adjusting the waveform, can also reduce crystallization crack control heat input.
2, stomatal problem
aluminum alloy of different kinds of stomatal type is also different. It is generally believed that aluminum alloy produced the following categories in the process of welding porosity.
1, the protective gas pores. In high energy in the process of automatic welding machine for welding aluminum alloy, because of the strong evaporation molten metal at the forefront of the bottom hole, make the protective gas were involved in the molten pool formed bubbles and when bubbles to escape and residual becomes a hole in the solid aluminum alloy.
2, hole collapse of pores. In the process of welding, when the surface tension is greater than the vapor pressure, the holes will not be able to maintain stable and collapse, metal to fill the holes are formed. To reduce or eliminate blowhole defects in aluminum alloy welding also has a lot of practical measures, such as adjusting the power waveform, reduce holes unstable collapse, change focus beam height and tilt illuminate, applying the electromagnetic field and in the welding process in vacuum welding, etc. Emerged in recent years, with wire filling or preset alloy powder, composite heat source and double focus of technology to reduce the porosity, has a good effect.
3, hydrogen vent. Aluminium alloy after melting in a hydrogen environment, its internal hydrogen content can reach 0. More than 69 ml / 100 g. But after solidification, the equilibrium condition of dissolved hydrogen capacity is only 0. 036 ml / 100 g, both differ nearly 20 times. Therefore, in the process of from the liquid to solid, liquid aluminum in excess hydrogen is bound to precipitate. If exhalation hydrogen can't well floatation escape, gather integration bubbles to remain in solid aluminum alloy become porosity.
we want more welding machine price, welcome to inquire, hotline:
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