choose stainless steel welded tube

Next, let’s delve into how to accurately assess the quality of weld seams on stainless steel welded tubes:

• Visual Inspection Method:
  • High-quality stainless steel weld seams typically exhibit natural shades such as silver-white, bright white, silver-gray, or dark gray, with a uniform and consistent overall appearance.
  • In contrast, inferior weld seams may display abnormal colors such as gray-brown, dark brown, or black-red, indicating the possible addition of other heavy metal elements or impurities, leading to a decrease in weld seam quality.
  • A black coloration in the weld seam may suggest the inappropriate addition of heavy metal elements; a gray-white or light blue coloration may indicate that no additional impurities were added to the weld seam; while yellow coloration may suggest the addition of sulfur components.
• Acid Testing Method:

By adding acidic reagents to the surface of the weld seam, we can observe its reaction. If the weld seam is defective, bubbles will form when the acidic reagent comes into contact with it. This apparent phenomenon can serve as an important indicator for assessing weld seam quality.

• Ammonium Chloride Solution Testing Method:

Similar to the acid testing method, dripping ammonium chloride solution onto the weld seam and observing its reaction can help assess weld seam quality. If the weld seam quality is poor, bubbles will also form when the solution comes into contact with it. This testing method can also assist us in accurately determining the quality of stainless steel weld seams.