Welding – Projects and Qualified Teams

Welding is the heart of nearly every steel structure: without proper welds there is no safe load-bearing system. The trade covers all thermal joining processes – MAG (metal active gas), TIG (tungsten inert gas), MMA (manual metal arc), MIG for aluminium, plus specialist methods like overlay welding, repair welding, and underwater welding. Welders work in steel construction, plant, shipbuilding, pipework, vessels, and repair shops. Quality depends on welder qualification, welding procedure specification (WPS), preheating, pass build-up, and non-destructive testing. Example Germany: welder qualifications per DIN EN ISO 9606-1 (steel), 9606-2 (aluminium), assessment per DIN EN ISO 5817.

FAQ

How much does a welder cost per hour?

Which welder qualifications exist?

What is a WPS and why is it important?

Which inspection methods are used?

What are the most common weld defects?

Which safety and health hazards apply?

How much does a welder cost per hour?: Example Germany: MAG steel welder 35–55 €/h, TIG stainless/Al welder 45–70 €/h, pipe welder with class approval 50–80 €/h, specialist welder (nozzles, high pressure) 60–100 €/h. Travel and per diem on remote sites extra. In Poland 30–40 % below.
Which welder qualifications exist?: Example Germany: DIN EN ISO 9606-1 for steel, with scope by material (S235 to high-strength grades), process (111, 135, 136, 138, 141), position (PA to PG), thickness, and joint type. Renewable annually with continuous welding, otherwise re-test after 6 months break.
What is a WPS and why is it important?: Welding Procedure Specification – approved instruction with all parameters: material, filler, current, voltage, pass build-up, preheat, interpass temperature. Mandatory for load-bearing structures DIN EN 1090 and pressure equipment 2014/68/EU. Qualified through procedure test WPQR.
Which inspection methods are used?: Visual VT on every weld. Magnetic particle MT for near-surface cracks in ferromagnetic steels. Penetrant PT for non-magnetic materials. Ultrasonic UT for volumetric testing of load-bearing welds. Radiography RT for critical joints, especially pressure equipment and pipework.
What are the most common weld defects?: Lack of fusion from too low current or too fast travel, porosity from damp filler or poor shielding gas, cracks from hydrogen embrittlement in high-strength steels without preheating, distortion from wrong welding sequence, end craters.
Which safety and health hazards apply?: Example Germany: TRGS 528 (welding fumes, statutory cancer risk on stainless), noise > 85 dB(A) requires hearing protection, UV requires welding clothing and auto-darkening helmet. Respiratory protection mandatory on stainless (Cr-VI compounds).

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