The Hazards and Precautions of Bubbles in Welds of Acoustic Tubes
2025-05-28 16:06:19
Acoustic test tube weld porosity not only affects the soundness of the sounding tube weld, resulting in leakage of the sound tube, and will become the site of initiation of corrosion, severe low weld strength and toughness.
The factors that produce negative pores in the weld include: moisture, dirt, scale and iron filings in the flux, the composition and thickness of the welding, the appearance quality of the steel plate, and the disposal of the steel plate, the welding process, and the steel tube forming process.
Acoustic pipe weld joint prevention and control steps are:
1, flux identity. When the weld contains the appropriate amount of CaF2 and SiO2, it will absorb a large amount of H2, which is naturally highly stable and insoluble in HF of the liquid metal, so that the formation of the hydrogen gas hole can be prevented.
2. The concentration of flux concentration is usually 25-45mm. The flux particle size is large, and the density is the smallest when the aggregate thickness is small. On the contrary, the minimum value is taken. The maximum current and the minimum welding thickness are the maximum values, otherwise the minimum value is taken. When the humidity or humidity is high, the accepted flux should be dried before use.
3, steel plate appearance disposal punishment. In order to stop the formation of the wrought iron strips, such as iron strips that have been uncoiled and leveled off, a plate surface exclusion device shall be provided.
4, steel plate edge disposal punishment. Rust and burr sweep devices should be installed on the edge of the steel plate to eliminate the possibility of producing negative pores. The position of the sweeping device is preferably located after the edge milling machine and the disc cutter. The layout of the device is an automatic wire wheel that can adjust the gap between the two upper and lower positions, and presses the board edge up and down.
5, the weld appearance. The forming coefficient of the weld is too small, the shape of the weld is narrow and deep, gas and mixture do not float easily, and pores and slag are easily formed. As usual, the weld seam forming coefficient is controlled at 1.3-1.5, the acoustic tube takes the maximum value, and the thin wall takes the minimum value.
6, reduce the secondary magnetic field. In order to eliminate the influence of magnetic bias blow, the connection position of the welding cable on the workpiece should be only about to be disconnected from the welding terminal, and the secondary welding magnetic field generated on the workpiece should be prevented from occurring in the department.
7, process aspects. Should be a low welding rate or increase the current, thus delaying the crystallization rate of the weld pool metal, in order to facilitate the escape of gas, and if the delivery position of the strip is unstable, mediation should be held in real time to prevent fine tuning of the front axle or rear The bridge is maintained in shape, causing gas escape difficulties.
The factors that produce negative pores in the weld include: moisture, dirt, scale and iron filings in the flux, the composition and thickness of the welding, the appearance quality of the steel plate, and the disposal of the steel plate, the welding process, and the steel tube forming process.
Acoustic pipe weld joint prevention and control steps are:
1, flux identity. When the weld contains the appropriate amount of CaF2 and SiO2, it will absorb a large amount of H2, which is naturally highly stable and insoluble in HF of the liquid metal, so that the formation of the hydrogen gas hole can be prevented.
2. The concentration of flux concentration is usually 25-45mm. The flux particle size is large, and the density is the smallest when the aggregate thickness is small. On the contrary, the minimum value is taken. The maximum current and the minimum welding thickness are the maximum values, otherwise the minimum value is taken. When the humidity or humidity is high, the accepted flux should be dried before use.
3, steel plate appearance disposal punishment. In order to stop the formation of the wrought iron strips, such as iron strips that have been uncoiled and leveled off, a plate surface exclusion device shall be provided.
4, steel plate edge disposal punishment. Rust and burr sweep devices should be installed on the edge of the steel plate to eliminate the possibility of producing negative pores. The position of the sweeping device is preferably located after the edge milling machine and the disc cutter. The layout of the device is an automatic wire wheel that can adjust the gap between the two upper and lower positions, and presses the board edge up and down.
5, the weld appearance. The forming coefficient of the weld is too small, the shape of the weld is narrow and deep, gas and mixture do not float easily, and pores and slag are easily formed. As usual, the weld seam forming coefficient is controlled at 1.3-1.5, the acoustic tube takes the maximum value, and the thin wall takes the minimum value.
6, reduce the secondary magnetic field. In order to eliminate the influence of magnetic bias blow, the connection position of the welding cable on the workpiece should be only about to be disconnected from the welding terminal, and the secondary welding magnetic field generated on the workpiece should be prevented from occurring in the department.
7, process aspects. Should be a low welding rate or increase the current, thus delaying the crystallization rate of the weld pool metal, in order to facilitate the escape of gas, and if the delivery position of the strip is unstable, mediation should be held in real time to prevent fine tuning of the front axle or rear The bridge is maintained in shape, causing gas escape difficulties.
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