EN ISO 3834 Quality requirements for fusion welding of metallic materials

Definition of the quality system in welding

The ISO 3834 standard specifies the requirements for the welding process, which is one of the key technologies in many industrial sectors. In view of this fact, it is essential to comply with all established requirements, as failure to do so may affect product quality, property, and worker health. Quality management certification in welding is linked to the certification of the Quality Management System (QMS) according to ISO 9001.

Who is the quality management system in welding intended for?

The system is intended for all organizations involved in welding. Depending on the nature of the welded products, certification is possible according to the following standards:

ISO 3834-2 (higher level of quality requirements)
ISO 3834-3 (standard level of quality requirements)
ISO 3834-4 (basic level of quality requirements)

Benefits of a quality management system in welding

Application in areas where ISO 3834 certification is a requirement for tenders – i.e. pressure, gas and lifting equipment, steel structures, etc.
More effective weld quality control through proper management of welding processes
A certified manufacturer carries out the welding quality process in accordance with the requirements of standards
Guarantee of consistency in the welding production process, and thus stable and high quality of services and products provided to customers
Cost optimization in terms of reducing operating costs, lowering costs of non-conforming products, saving raw materials and energy

Accredited certification EN ISO 3834-4:2021

sequence number	Title of field	NACE code
1	C24 - Manufacture of basic metals	24
2	C24.1 - Manufacture of basic iron and steel and of ferro-alloys	24.1
3	C24.2 - Manufacture of tubes, pipes, hollow profiles and related fittings, of steel	24.2
4	C24.3 - Manufacture of other products of first processing of steel	24.3
5	C24.4 - Manufacture of basic precious and other non-ferrous metals	24.4
6	C24.5 - Casting of metals	24.5
7	C25 - Manufacture of fabricated metal products, except machinery and equipment	25
8	C25.1 - Manufacture of structural metal products	25.1
9	C25.2 - Manufacture of tanks, reservoirs and containers of metal	25.2
10	C25.3 - Manufacture of steam generators, except central heating hot water boilers	25.3
11	C25.5 - Forging, pressing, stamping and roll-forming of metal; powder metallurgy	25.5
12	C25.6 - Treatment and coating of metals; machining	25.6
13	C25.7 - Manufacture of cutlery, tools and general hardware	25.7
14	C25.9 - Manufacture of other fabricated metal products	25.9
15	C26 - Manufacture of computer, electronic and optical products	26
16	C26.1 - Manufacture of electronic components and boards	26.1
17	C26.2 - Manufacture of computers and peripheral equipment	26.2
18	C26.3 - Manufacture of communication equipment	26.3
19	C26.4 - Manufacture of consumer electronics	26.4
20	C26.5 - Manufacture of instruments and appliances for measuring, testing and navigation; watches and clocks	26.5
21	C26.6 - Manufacture of irradiation, electromedical and electrotherapeutic equipment	26.6
22	C26.7 - Manufacture of optical instruments and photographic equipment	26.7
23	C26.8 - Manufacture of magnetic and optical media	26.8
24	C27 - Manufacture of electrical equipment	27
25	C27.1 - Manufacture of electric motors, generators, transformers and electricity distribution and control apparatus	27.1
26	C27.2 - Manufacture of batteries and accumulators	27.2
27	C27.3 - Manufacture of wiring and wiring devices	27.3
28	C27.4 - Manufacture of electric lighting equipment	27.4
29	C27.5 - Manufacture of domestic appliances	27.5
30	C27.9 - Manufacture of other electrical equipment	27.9
31	C28 - Manufacture of machinery and equipment n.e.c.	28
32	C28.1 - Manufacture of general-purpose machinery	28.1
33	C28.2 - Manufacture of other general-purpose machinery	28.2
34	C28.3 - Manufacture of agricultural and forestry machinery	28.3
35	C28.4 - Manufacture of metal forming machinery and machine tools	28.4
36	C28.9 - Manufacture of other special-purpose machinery	28.9
37	C32.5 - Manufacture of medical and dental instruments and supplies	32.5
38	C33.1.1 - Repair of fabricated metal products	33.11
39	C33.1.2 - Repair of machinery	33.12
40	C33.1.3 - Repair of electronic and optical equipment	33.13
41	C33.1.4 - Repair of electrical equipment	33.14
42	C33.2 - Installation of industrial machinery and equipment	33.2
43	F41 - Construction of buildings	41
44	F41.1 - Development of building projects	41.1
45	F41.2 - Construction of residential and non-residential buildings	41.2
46	F42 - Civil engineering	42
47	F42.1 - Construction of roads and railways	42.1
48	F42.2 - Construction of utility projects	42.2
49	F42.9 - Construction of other civil engineering projects	42.9
50	F43 - Specialised construction activities	43
51	F43.1 - Demolition and site preparation	43.1
52	F43.2 - Electrical, plumbing and other construction installation activities	43.2
53	F43.3 - Building completion and finishing	43.3
54	F43.9 - Other specialised construction activities	43.9
55	G45 - Wholesale and retail trade and repair of motor vehicles and motorcycles	45
56	G45.1 - Sale of motor vehicles	45.1
57	G45.2 - Maintenance and repair of motor vehicles	45.2
58	G45.3 - Sale of motor vehicle parts and accessories	45.3
59	G45.4 - Sale, maintenance and repair of motorcycles and related parts and accessories	45.4
60	S95.1 - Repair of computers and communication equipment	95.1

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