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Insight to Galvanizing Lines


Galvanizing lines can include machinery for coil joining before the galvanizing process. While steel can be welded after galvanizing, it needs special provisions like ventilation due to smoke.

Galvanizing Process 

Galvanizing is the method of coating steel with zinc. “Coating” is a little bit of an inaccurate description nonetheless, as the zinc essentially becomes part of the steel. The explanation steel is galvanized is to stop rust and corrosion.

The Chemistry 

When steel is dipped in zinc and put in contact with the air, the pure zinc goes through a reaction with oxygen to make zinc oxide. The zinc oxide reacts with carbon-dioxide to form zinc carbonate.

Zinc carbonate is a leaden grey, robust material that generally stops further corrosion. Welding rust proofed steel not only causes smoke, but any time you weld coated metals, the coating liquefies and can contaminate the base metal and filler metal.

Weld and Zinc 

If zinc gets into the weld, it’ll cause cracks called “zinc penetration cracking” that makes the weld in total less robust. This is often evaded by utilizing welds having less than 0.2% silicon in the welds. But with galvanizing lines, it is standard to do any coil joining before the galvanizing process. Applications for rustproof steel include use in safety obstructions, appliances, auto body parts, handrails, walling, and roofing. Metal buckets are sometimes galvanized, and treated steel is utilized in ductwork for cooling and heating systems. Apart from hot dip galvanizing, metal can be galvanized by electroplating, which deposits a layer of zinc from an aqueous electrolyte. This forms an especially thin, powerful bond. Thermal diffusion galvanizing creates a zinc coating like that produced by hot dip galvanizing. With thermal diffusion galvanizing, zinc is applied in the guise of a powder mixed with accelerator chemicals. The metal and zinc compound are sealed up in a drum, and the drum is revolved in a stove. The accelerator chemicals cause the iron-zinc diffusion, or amalgamating, occurs at a lower temperature than does hot dip type galvanizing. Thermal diffusion galvanizing leads to a uniform coating that’s more wear-resistant. The method also disposes of need for caustic, acid, and flux baths to prepare the parts for hot dipping. Since hot dip galvanizing lines use coiled steel, the potency of the lines can be improved by utilizing bigger coils or by inserting a step to join the end of one coil to the start of the next so providing the machine with a continual feed that cuts down time seriously. A sequence of machinery that encompasses a coil joining operation before hot dip galvanizing might go like this : pay-off reel leveller cropping shear welding machine entry loop accumulator Often a welding machine, whether compact or fixed, will include a TIG end welder. TIG stands for tungsten inactive gas.

The Weld Kind 

This kind of welder generates heat with an arc of electricity going from a tungsten electrode to the metal welding surface. A sheath of argon gas combined with carbon-dioxide surrounding the electrode keeps the weld as clean and free from waste as practical. The trailing coil end is first sheared and positioned within the weld station. Then the premiere end of the following coil is sheared and positioned. The welding is automated. TIG welding is excellent for coil joining however it can be threatening done manually. There are TIG machines for coil joining where the coil ends to be joined are fed in, instantly welded by the machine, and the just constant line of steel then flows onto an entry accumulator. Processing plants like those with galvanizing lines that use cold rolled steel can experience productiveness drops of twenty to 30 percent when they need to stop production lines so that a new coil of steel can be threaded in when the old coil runs out. A coil joining machine included in the production process can cut productiveness losses radically by permitting constant feeding of coiled steel into the production machinery. Guild offers a total line of coil end welders for nearly any application.

Patented Equipments in Galvanizing Lines 

Normally all main equipments in galvanizing lines are Patented product. The list includes includes Zipwelders, resistance welders, semi-automatic shearwelders, and strip accumulators including Supercoils, Superloops and Continuing Coils. Guild also produces a full line of rotary and cropshears together with uncoilers, speed funnels, and flatteners.


Engineer Sheikh Imran is a manufacturing expert of over ten years experience in the field of manufacturing. He did his BE in Industrial Manufacturing from NED University in 2010. Imran has broad knowledge and expertise in the areas of metal cutting and cutting tools and in R & D of manufacturing methodologies. He has worked for more than 8 years about various projects under the following heads: Manufacturing process improvement Boiler Manufacturing Manufacturing system improvement Projects

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