History of blacksmithing: from the glow of the forge to the CNC hall

Few trades are as old as the blacksmith's. Ever since humans learned to extract and shape iron, the blacksmith has stood at the forge as the one who could transform ore into tools, weapons, fittings, and art. For millennia the blacksmith was one of the village's indispensable figures — the one who made plowshares, horseshoes, nails, locks, and all the iron everyday life required. The trade's history is in many ways the story of how we learned to master metal.

§The Iron Age: the birth of the trade

Iron extraction itself arose in ancient times — the earliest traces of iron smelting are known from around the 2nd millennium BC in Asia Minor and from there the technique spread through Europe Asia and Africa. In the period we call the Iron Age iron replaced bronze as the most important utility metal. In the North the Iron Age really set in in the last centuries before our time reckoning.

The early smith extracted iron himself in a small furnace — a so-called blast furnace — built of clay and stone. With bellows you blew air in through a nozzle so the charcoal could reach a high enough temperature. The result was not liquid metal but a porous lump called a bloom that had to be hammered and folded again and again to press out slag and make the iron usable. That was called wrought iron. Every single piece of iron was dearly bought in hours at the forge.

§How the key players work together to solve a patient's problems

The classic smithy only changed slowly over many centuries. The basic tools were the same as any smith still knows: the forge to heat the iron, the anvil to shape it on, and the hammer and tongs in hand. Temperature was not measured with instruments but read from the iron's glow color — from dark red over cherry red to light yellow and white hot. Being able to read the glow was an art that only came with experience.

• 01Forge with charcoal and hand-drawn or foot-trodden bellows as heat source.
• 02The anvil with horn and flat face for bending, drawing out and forging
• 03Hammer, pliers, chisel and drift as the daily hand tools
• 04Quenching tank with water to harden and cool the iron
• 05The colour of incandescence as the only 'thermometer'

Joints were made by forge welding: two white-hot pieces of iron were hammered together so they melted at the surface and became one. It required precise temperature and perfectly timed hammer strokes. Nailed and riveted joints were equally everyday, as electrical welding lay many centuries in the future.

§Guild time: the trade is organized

In the Middle Ages and onwards, the blacksmith increasingly moved into the towns and organised himself in guilds. The guild was both a professional and social association: it set rules for who could practise the trade, monitored quality, and trained new journeymen through apprenticeships. The path went from apprentice through journeyman to master, often spiced with wandering years where the journeyman worked for different masters. Guilds effectively had a monopoly on the trade in market towns.

In Denmark this system was gradually broken up in the 1800s. With the Business Act of 1857 whose repeal of the guilds' monopoly on crafts came into force in 1862 the guilds' monopoly was abolished and it became free to practice a craft and trade even outside towns. Free business opened up the profession but the tradition of apprenticeship journeyman exam and mastery lived on — and still does in the modern vocational education system.

“The blacksmith's authority rested on the fact that he could do what no one else could: shape hard iron to his will. That authority followed the trade from the village forge straight into industry's halls.”

— About the history of blacksmithing

§Industrialisation changes everything

The industrial revolution in the 18th and 19th centuries turned the blacksmith's trade upside down. Water power and later steam drove large hammers and bellows, so heavy forging work could be mechanised. Even more important were new ways of producing iron and steel on a large scale, which made raw iron cheap and uniform. The blacksmith no longer needed to produce his own iron in the blast furnace — he bought ready-rolled steel in standard profiles.

At the same time factories took over mass production of what the smith previously made by hand: nails fittings tools and equipment. Many village smiths lost this work and specialised instead — some as locksmiths others as machine and repair smiths. The trade was divided into branches.

§Electrification and modern welding.

One of the biggest leaps came with welding. The electric arc was established in the 1800s — arc welding with electrode was developed in the 1880s and shortly after came metal electrode welding. In parallel gas welding with acetylene and oxygen was developed in the early 1900s. During the 1900s came the coated electrodes and later the gas-shielded wire processes MIG and MAG and TIG welding. Suddenly you could join steel quickly and strongly without hammering — that fundamentally changed the construction smith's daily life.

§The blacksmith today

The modern smithy combines the ancient and the newest. Forge and anvil are still found — especially among art and locksmith smiths — but alongside stand CNC-controlled cutting milling and bending machines robot welding systems and laser cutters. Drawings are delivered as 3D models and quality is documented according to European standards which the guild smith never knew about.

But the core is the same. A blacksmith must still understand the material, read a task, choose the right method and check their own work. Machines have taken over the muscles, but not the handiwork and professional expertise. Therefore, the blacksmith today is both someone who can strike an arc and program a machine — and someone who fundamentally practises one of humanity's oldest crafts.