Preparing for galvanizing
Quality galvanizing begins not when the product arrives at galvanizing plant, and long before this, on the table of the designer. Only collaboration between the designer, producer and galvanizer from beginning to end project can provide time saving, cost reduction and quality zinc coating.
Technical conditions for the preparation of metal products for galvanizing:
- The surface material shouldn’t have layers of calx, welding slag and drops, traces of welding “spray”, dirt and paint markings, “sprays” , excessive amounts of oils and fats, and residues of graphite.
- Metal products should have holes or elements that allow to hang them on the wire to the vehicles traverse.
- Each element must have the technological holes.
- Min. size and number of holes given in the table below:
- The product can’t have closed cavities which may damage the product during galvanizing, and injury the workers.
- Material should not have cracks or hollow that prevent free swam zinc and form ash.
- The product can not have “pockets”, in which can remain molten zinc or delays air.
- The content of silicon in a product intended for hot dip galvanizing shall be less than 0.03% and carbon – less than 0.24%.
- Metal products must have certificates and reports of chemical analysis of metal from which they are made.
- Products with internal stress after pre-processing such as welding, stamping and so on;during the galvanizing process can be deformed.
- Welding of structural elements necessary to carry out “butt” or bilateral sutures. Welded seams connections should be closed.
In the case of not making the customer structures to galvanizing, according the above requirements, Contractor shall not be liable for damages for product defects and zinc coating.
You must use materials of similar chemical composition. We encourage to avoid materials in which the content of silicon is in the range 0.03% – 0.12% and those in which the amount of carbon and silicon is greater than 0.5%.
Unacceptable:
Design of closed spaces.
Connection elements with different thicknesses, the ratio of maximum and minimum thickness can not be greater than 5:1, because during immersion in a temperature 450 ° C possible deformation previously manufactured forms.
Must be avoided:
Bulky items. Zinc-plating of flat elements is easier and more economical. The elements with larger dimensions can be galvanized after prior consultation with our specialists.
Memo to Customer
When sending items for galvanizing:
Before submitting articles to hot dip galvanizing plant, carefully review all products for compliance to Requirements … “( the presence of technological openings, etc. ..);
Products should be loaded on pallets or wood substrate;
Each pack must have tallies with the name of the company, the name and number of products. Small goods transported in containers (container), with the obligatory indication of weight.
Required documents:
invoice (2 copies).
specification (2 copies). in the form: № | Product Name | Number, pcs | Weight unit kg total weight, kg
- In selecting the finished galvanized products:
Before sending transport for galvanized products make sure that services are fully paid.
If you remove the galvanized products immediately after galvanizing, transports them from covering car and avoid the rain and snow. Keep freshly coated products in dry, well ventilated area.
Required documents:
power of attorney from the payer organization (original);
passport.
