Frames and sub-assemblies such as trusses, girders and other pre-formed welded assemblies need special attention by the detailer to ensure that the assembly can be immersed and withdrawn from each stage in the process in a safe, efficient and effective manner. The pre-treatment solutions from the galvanizing process and the molten zinc must be able …
Galvanizing of hollow sections and pipes requires that the item be properly vented to allow for the free flow of Pre-treatment Liquids both inside and outside of the item. Also, when the item is dipped into the galvanizing bath it must allow for the ingress of the molten zinc to fully coat both the inside …
Provided the general Welding Guidelines are observed and that the necessary precautions are taken to Avoid Distortion, the galvanizing of open sections present few problems, their open nature ensures an efficient run-off of pre-treatment liquids and a smooth flow and equal coating of molten zinc. However, end-plates, stiffeners and gusset plates can hinder drainage and …
There are various do’s-and-don’ts that should be observed by the detailer when it comes to welding of fabricated structures or components which are to be galvanized. The first considerations relate to the residual stresses which may lead to distortion. (Refer to: Avoiding Distortion during Hot Dip Galvanizing) The second relates to proper venting and the …
Distortion occurs due to the relief of locked-in stresses within a steel section or fabrication. At room temperature, the steel is sufficiently strong to accommodate such stresses, but at the galvanizing bath temperature (about 450°C), the steel`s yield strength may be reduced by up to 40% (Note, the steel recovers its full strength when it …
In suitable applications, hot dip galvanizing provides ideal corrosion protection for steel – no other coating matches galvanizing’s unique combination of low initial cost, ease of inspection for coating quality, durability, predictable performance, low maintenance and resistance to abrasion and mechanical damage. Hot dip galvanizing is often perceived to be more expensive than it is. …
