Porosity in stainless steel welded pipes refers to voids that form in the weld seam during the welding process when gas fails to escape in time. The presence of porosity can seriously affect the quality of the welded pipe. Firstly, porosity reduces the strength and toughness of the weld seam. Porosity decreases the effective load-bearing area of the weld, making it more prone to cracking when subjected to external forces. Moreover, the metal structure around the porosity may experience stress concentration due to the presence of these voids, further weakening the strength and toughness of the weld.
Secondly, porosity can affect the sealability of the weld. In applications where high sealability is required, such as in petrochemical and aerospace industries, porosity in the weld seam may lead to media leakage, which could result in severe safety hazards.
Lastly, porosity affects the aesthetic quality of the weld. Surface porosity can make the weld surface uneven, negatively impacting the product's appearance and reducing its market competitiveness.
Causes of Porosity in Stainless Steel Welded Pipes
Improper Surface Treatment of Base Material If the base material surface contains impurities such as oil, rust, water stains, or oxide scale, these impurities can decompose and release gas during welding, increasing the likelihood of porosity formation in the weld.
Impact of Welding Parameters Welding current, voltage, and welding speed are crucial factors that influence porosity formation. If the welding speed is too slow and the current is too high, the molten pool will overheat, increasing the solubility of gases. However, during cooling, the gas may not escape in time, leading to porosity formation. On the other hand, if the welding speed is too fast and the current is too low, the molten pool temperature will be too low, resulting in poor fluidity and difficulty in gas escape.
Preventive Measures for Porosity in Stainless Steel Welded Pipes
Before welding, the surface of the base material should be thoroughly cleaned to remove oil, rust, moisture, oxide scale, and other impurities. Additionally, it is important to select appropriate welding current, voltage, and welding speed. To ensure high welding quality, a smaller welding current and voltage should be chosen where possible, while appropriately lowering the welding speed to allow sufficient time for the gas to escape, thereby effectively preventing porosity formation.
Every time the finishing tube is rolled, it must go through the process of solution treatment. Ta ensure that the performance of the steel pipe meets the technical requirements. and to provide guarantee for the post-process processing or use. Bright solution treatment process of ultra-long seamless steel pipe has always been a difficulty in the industry.
Traditional electric furnace equipment is large,covers a large area, has high energy consumption and large gas consumption, so it is difficult for realize bright solution process. After years of hard work and innovative development, the use of current advanced induction heating technology and DSP power supply. Precision control of heating temperature to ensure that the temperature is controlled within t2C,to solve the technical problem of inaccurate induction heating temperature control. The heated steel pipe is cooled by "heat conduction"in a special closed cooling tunnel, which greatly reduces the gas consumption and is more environmentally friendly.
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