I believe that you can clearly know the difference between seamless steel pipe and welded steel pipe from their names. seamless steel pipe is a steel pipe without welding seam, and welded steel pipe has obvious welding seam.
Do they have any other differences besides this one?
The working pressure is different: the working pressure of seamless steel pipe is higher than that of welded steel pipe, which is generally about 10MPa, while the working pressure of seamless steel pipe is much higher than this pressure strength.
Different processes: seamless steel pipes are made by piercing steel billets or solid tube embryos, and processed by hot rolling or cold rolling. Welded steel pipe is formed by bending and welding steel plate or strip.
The use of raw materials is different: seamless steel pipes use steel billets or solid tube embryos, and welded steel pipes use steel plates or strips.
ASME B36.10M Standard for Hot Rolled Seamless Steel pipes
Analysis and Preventive Measures of Cold Working Cracks in Seamless steel pipes
What is the purpose of Q345C seamless steel pipe
The main factors affecting the internal hole finish of cold-drawn seamless steel pipe are as follows:
