Why do weld joints fail when soldered together?
The first two are often mistaken for a welding technique, but are actually completely different approaches. When metals are soldered together the two metals touch and a third metal is added, almost like glue, in-between the joined parts. Brazing is similar but it occurs at a much higher temperature and usually happens with brasses.
Can a weld be repaired on a worn shaft?
In principle, weld repair should be attempted only on annealed material that will be hardened again by heat treatment after welding in the usual way. Restoring dimensions in a worn shaft is an easier task.
What happens when parts are not clean when welding?
If the parts are not clean when welding occurs the weld joint will lack uniformity and could also contain porosity around the debris. Porosity is very bad for materials if you need them to be strong. Think about packing peanuts for example, they are filled with pores in order to create a comfortable cushion.
Why does high alloy steel crack when welding?
High-alloy steel is prone to cracking when welded, unless special procedures, such as preheating, are put in place. The welding heat reduces the hardness and strength of the original material, but may promote the formation of a very hard layer in the heat-affected zone, the region bordering the weld.
What is the weldhelp resistance welding troubleshooting guide?
The WeldHelp Resistance Welding Troubleshooting Guide is written for operators and engineers to help diagnose and solve common spot welding defects and issues, projection welding and seam welding applications. Consider it an experienced second opinion in a specialized field.
What causes a weld joint to fail during welding?
They are caused by moisture or by the mixture of the carbon and oxygen, which turns into CO 2. The metal parts need to be dry to help prevent any porosity from forming during welding.While these seven reasons for weld joint failures may leave you feeling a bit melancholy do not despair!
How does welding affect the repair of a shaft?
Welding procedures can affect repairs in many ways. High-alloy steel is prone to cracking when welded, unless special procedures, such as preheating, are put in place.
Why do I have stuck welds on my welding machine?
Undersized welds can be the product of dirty or damaged parts and materials, or of incorrect welding setups. Electrode wear, low weld current and high weld force may cause “stuck welds,” when only a slight, weak bond is formed.