Linear Slag Inclusion Alignment
Linear slag pore chains are connected pore chains in the weld that result from incomplete slag removal. They act like internal notches and can lead to cracking.
Physical and chemical mechanism of action
Linear slag pore chains form by the accumulation of non-metallic residues, such as flux or coatings, in the weld. These pore chains connect multiple layers of weld metal and create a continuous path for stresses.
Metallurgical relevance & risks in welding
These pore chains can lead to cracking, especially under mechanical load. The stresses building up in the pores can break the material along the slag chains, leading to a cascading failure of the weld.
Workshop practice & action instructions
To avoid linear slag pore chains, thorough slag removal is essential. This includes proper application of flux and coatings and allowing enough time for slag removal before welding. Too short a time or missing flux can lead to pore chain formation. When selecting flux and coatings, make sure they are suitable for the specific metal and allow effective slag removal.