Method of continuous tube forming and galvanizing

Abstract

Abstract A PROCESS FOR CONTINUOUSLY FORMING AND GALVANIZING TUBING FROM STRIP IN WHICH THE STEEL STRIP IS FORMED TO ROUNDED SHAPE WHILE BEING ADVANCED CONTINUOUSLY IN ONE DIRECTION TO BRING THE LATERAL EDGE TOGETHER, CONTINUOUSLY WELDING THE ABUTTING EDGES OF THE STRIP TO SEAL THE FORMED TUBING AND SCARFING THE WELDED PORTION OF THE TUBING TO CUT OFF THE PORTIONS OF THE WELD PROJECTING BEYOND THE PERIPHERY, CLEANING THE OUTER SURFACES OF THE TUBING WITH CLEANING SOLUTIONS AND RISING THE CLEANED TUBING WITH WATER FOR REMOVAL OF THE CLEANING SOLUTIONS, ADVANCING THE CLEANING TUBING CONTINUOUSLY THROUGH AN ENCLOSURE MAINTAINED AT ELEVATED TEMPERATURE TO PREHEAT THE TUBING, ADVANCING THE PREHEATED TUBING THROUGH A BATH OF MOLTEN ZINC ARRANGED IN LINEAR ALIGNMENT WITH THE FORMED TUBING IN A POSITION SO THAT THE TUBING ENTERS AND LEAVES THE BATH AND PASSES THROUGH THE BATH AT A LEVEL BELOW THE SURFACE OF THE BATH TO AVOID CONTACT WITH OXIDES ON THE SURFACE OF THE BATH, CONTINUOUSLY ADDING MOLTEN ZINC TO THE BATH IN AN AMOUNT IN EXCESS OF THAT TAKEN BY THE TUBING TO CAUSE OVERFLOW FROM THE EDGES OF THE BATH BEYOND THE TUBING TO CONTINUOUSLY FLUSH OXIDES AND SLAG FROM THE BATH, ENCLOSING THE BATH WITHIN A HOUSING WHICH COMMUNICATES WITH THE ENCLOSURE FOR PREHEATING AND INTRODUCING NON-OXIDIZING GAS INTO THE ENCLOSURE FOR MAINTAINING A RELATIVELY NON-OXIDIZING ATOMSPHERE DURING PREHEATING AND GLAVANIZING, REMOVING EXCESS ZINC FROM THE SURFACE OF THE TUBING AFTER LEAVING THE BATH BY MEANS OF AN AIR KNIFE THROUGH WHICH AIR IS AT ELEVATED TEMPERATURE IS PROJECTED ANGULARLY ONTO THE SURFACE OF THE TUBING AND THEN FREEZING THE COATING OF MOLTEN ZINC ON THE TUBING SURFACE.

Inventors

• 👤 Theodore H Krengel
• 👤 Emil Wilk

Bibliographic Details