When the cylinder is preheated, the welding temperature is about 170 degrees Celsius. The welding time is 2 hours. The time of hydrogen removal is about 600 DEG C. Why did the penetration crack occur? If you want to change the wire flux, what should be replaced?
This wire does not normally require hydrogen removal, etc. if it is Cr_Mo steel welding, you will need these steps (hydrogen removal, etc.).600 degrees, usually with a special heat treatment equipment, ordinary flame heating, you can not maintain such a high temperature. You can test the ring seam when you are heating. Is the temperature very uneven around it?.The material and thickness of base metal? The base material of this welding flux should be Q345 and so on. If it is thick enough to keep warm, there will be no problem between the interlayer and the rear heat.If the parent material is Cr_Mo steel, then there is no crack in the crack, and you use the wire is not correct, even if used for the right, this material is also prone to cracks.
1, can you explain some of the material of the cylinder? Wire diameter? Welding method? The material and thickness of base metal? Groove form?2, hydrogen treatment is generally at 400 degrees, can be used less than 600 degrees centigrade.
Your welding process record PRQ should be posted
