We continue our series of posts about corrosion. Today we will talk about corrosion of the welded joints, another great topic often requested by the users of our blog.
When welded joints corrosion occur?
When welding a joint on a stainless material, it is essential to evaluate certain parameters so as not to incur some inconvenience during the exercise phase. These oxidation phenomena occur in various ways as:
- on bead
- on located in the immediate vicinity.
Welded joints: what to consider?
It is important to consider some characteristics of the welded joints, so as to be able to evaluate the actual seal. In fact, there can be many cases. Here are some examples:
- the base metal resists the aggression of the working environment and the welded joint does not (incurring corrosive problems triggered by the welding process)
- the joint made with a noble material has a greater resistance to corrosion than a base metal.
What are the causes of stainless steel welded joints corrosion?
In order to understand the reasons why a welding bead presents corrosion phenomena, we must take into account several elements including:
- choice of basic material
- joint drawing
- joint cleaning
- choice of filler material
- welded bead defects
- welding sequence
- presence of cracks
- residual efforts
- final surface finishing operations.
In the next posts we will go to deepen all these aspects in the particular, so that you can better understand why corrosion is on the increase at welds.
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