Preparation of metal for welding
Analysis of weld defects clearly shows that a significant percentage of defects occurs due to bad quality of metal. Rework in the finished product is a time-consuming and technically difficult operation and does not always lead to complete restoration of the required properties of welded joints.
Pre-rolled, for welded constructions subjected to editing and cleaning to eliminate dirt and irregularities that arose after rolling, transportation or storage of the metal. The edit sheet is carried out in a proper mill, a sweep-in shot blast machine or in a special bath for etching and passivation.
The base metal in the weld areas should be cleaned of rust, oil, moisture, loose layer of oxides and other contaminants that could lead to the formation of pores and other defects in the joints.
Remove the work hardening
Edging machine for beveling machines. If necessary, use the cold bending of metal or bent in a heated state. The choice of a particular method is determined by the metal thickness and radius of curvature of the irregularities.
If necessary, details before welding is heated to 200 — 300 °C, and after the operation — annealed to eliminate residual stresses in the weld.
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