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← Welding
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Articles
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Articles
23
Certified welding and DS/EN-ISO 9606
Certification · 7 min
An explanation of what it means to be a certified welder what the standard DS/EN-ISO 9606 covers and how a certification is obtained and maintained.
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Welding methods in AMU context: gas, arc, TIG, MIG and MAG
Welding methods · 8 min
A comparative review of the welding methods typically included in AMU courses with a focus on what each is suited to.
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Safety: §17, hot work and district heating
Safety · 7 min
A review of the safety frameworks around welding — the §17 course rules for hot work and special considerations when working on district heating systems.
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Joint types and welding positions
Welding technique · 8 min
A review of the most common joint types and joint preparations plus welding positions — the foundation that determines how a joint is prepared and executed.
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Welding defects: types, causes and prevention
Quality · 8 min
A review of the most common welding faults — pores incomplete fusion burn-through slag inclusions and cracks — with focus on causes and how to prevent them.
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Welding fume and work environment
Work environment · 7 min
A review of the health hazards from welding — welding fume gases and radiation — and how extraction ventilation and personal protection protect the welder.
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WPS and WPQR: welding procedure documentation
Quality · 9 min
On professional welding work, you don't guess the parameters — they are fixed in an approved procedure. This article explains the chain from pWPS through the qualification test (WPQR) to the final WPS and what each means to the welder on the floor.
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Quality levels and control of welds
Quality · 9 min
How good should a weld be? It depends on the requirement. This article explains the quality levels in EN ISO 5817, how welds are controlled with visual, non-destructive and destructive methods, and why the right level is chosen based on the structure's needs.
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Thermal cutting and safe gas handling
Welding technique · 8 min
Cutting is part of a welder's daily routine, and gas cylinders are part of the work. This article covers common thermal cutting processes and — equally important — how to handle pressure cylinders and fuel gases safely.
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The history of welding: from forge welding to arc and laser
History · 11 min
Welding is an old idea in new technology. This article follows the development from ancient blacksmithing through the 19th century discovery of the electric arc and gas flame to the 20th century's MIG, MAG and TIG — and on to today's certified, standard-controlled and partly roboticized welding work.
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Materials in welding: mild steel stainless and aluminium
Materials · 8 min
A welder rarely meets only one type of metal. This article reviews what characterizes mild steel, stainless steel and aluminum as welding materials and why knowledge of the material's properties is as important as the welding technique itself.
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Filler materials and shielding gases: choice of consumables
Materials · 8 min
The right welding method is only half the story — the choice of electrode, welding wire and shielding gas determines the rest. This article covers the most common consumables in AMU welding and what they are used for.
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Robot welding and automation in the welding trade
Technique · 7 min
Denmark is one of the most robotpacked countries in Europe and welding is one of the areas where automation is advancing fastest. This article looks at why companies automate and what it means for the individual welder.
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VET allowance and the economy in an AMU welding course
Career · 6 min
Many refrain from taking an AMU course out of concern for the financial side. This article explains VEU compensation, how it works for a welding course, and what you as a course participant can specifically apply for.
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Career paths for the certified welder
Career · 8 min
A welding certificate is rarely the end goal — it is a beginning. This article maps the typical paths a welder can build their career on from the first VET course to specialised and well-paid niche areas.
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Ergonomics and physical working environment for welders.
Work environment · 7 min
Welding fume and arc light are not the only work environment factors a welder must take seriously. Improper working positions over many years can cause lasting damage. This article reviews what the Labour Directorate recommends and how the welding station can be set up better.
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Welding of pressure equipment and the PED directive
Quality · 7 min
Pressure vessels and pressurized pipe systems cannot simply be welded and put into use. They are covered by a European directive that sets requirements for the entire chain from material and procedure to welder and inspection. This article provides an overview from the welder's perspective.
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Underwater welding and specialized welding offshore.
Career · 6 min
Underwater welding is one of the most specialized and best-paid niches in the trade but it requires competencies from two different worlds at once. This article provides an overview of the way there and what the work involves.
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Process numbers: what do 111, 135 and 141 mean?
Welding technique · 6 min
On drawings, in a WPS and on your certificate, the welding process is given as a number. The article explains how the numbers in ISO 4063 are built up, which numbers you will meet in the workshop, and which traps there are in old papers.
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Read your welding certificate — the designation field by field
Certification · 6 min
A welding certificate does not cover «welding» in general, but one specific combination. The article explains the abbreviations on the certificate, what an example means, and how you keep the certificate valid.
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Hydrogen, carbon equivalent and preheating — why steel cracks
Materials · 7 min
Cold cracks can appear hours after the weld is finished. The article explains the carbon equivalent CE, the hydrogen classes, what the letters on an electrode mean, and why preheating is in the WPS.
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New for welders 2025-2026: rules, standards and your training
Rules · 6 min
Rules and standards for welders have changed a lot in 2025 and 2026. Here is the news in order, with date and source, so you know what applies now.
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Welding stainless steel: nickel, chromium 6 and the strictest limits
Work environment · 6 min
Stainless steel contains chromium and nickel, and when it is welded, they end up in the fumes. The article brings together the rules, the limit values and the processes that require extra care.
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