Welding seamless steel pipe
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Buy a significant range of lengths and diameters of steel seamless pipes at affordable prices from the manufacturer offers the company Elektrovek-steel. The supplier guarantees timely delivery of rolled metal to any point set by the customer.
Welding seamless steel pipes is performed either when replacing a certain section of the pipeline, or when installing a new shut-off valve in the pipeline. In any case, we are talking about butt welding, the methodology and sequence of which is regulated by the norms and rules of RD 39−01−0147014−537−87.
This guidance document establishes the main technological solutions for welding production at enterprises and organizations of ministries and departments that produce installation and repair work for the laying of pipelines and responsible metal structures.
RD 39−01−0147014−537−87 relies on the requirements of standards, SNiPs, as well as safety rules, which relate to the assembly, welding, heat treatment and quality control of welded joints of pipelines, as well as responsible metal structures where steel seamless pipes are used. The guideline document lists the recommended technological processes for electric arc and contact-butt welding of the types of pipes in question.
Requirements for technological components of welding extend to:
Welding electrodes. For manual welding of seamless steel pipes, electrodes of the following grades are used
|Type of electrode||Mechanical properties at normal temperature of weld metal or weld metal||Technological brands of electrodes||Welding consumables for welding|
|Temporary tensile strength, MPa (kgf / mm 2)||Relative extension, %||Impact strength, kJ / m 2 (kgf x m / cm 2)||Cored wire||Wire for welding in carbon dioxide||Under the flux||Wire|
|E38||372.6 (38)||14||295 (3)||Cretaceous, OC-1, AN-1, K-3||-||-||-||-|
|E42||411.9 (42)||18||785 (6)||ANO-1, ANO-5A, ANO-6M, ANO-17, OZS-6o, OMM5, OM-6||Sv-08GS|
|E46||4 51.1 (46)||18||785 (8)||ANO-3, ANO-4, ANO-4zh; ANO-13, ANO-14, ANO-18, ANO-20, MR-3, RBU-4, RBU-5, OZS-3, OZS-4, OZS-6, ZRS-1||PP-1DKK||Sv-08G2S||AN-348-A, AN-348-AM, OCT-45||Sv-08|
|E50||490.3 (50)||16||687 (7)||K-51, K-52, VSP-2, WCC-3, ANO-19||-||-||-||Sv-08HA, Sv-10G2|
|E42A||411.9 (42)||22||1471.5 (15)||UP-1/45, UP-2/45, OZS-2, ANO-7||PP-2DKK, PP-ANZ (7), (11), (12)||Sv-08G2S||AN348-A, AN348-AM, OCT-4,5, AN-47||Sv-08G2, Sv-10G2|
|E46A||451.1 (46)||22||1373 (14)||UОНИИ-13/45, СМ -11, Э138 / 45Н, АНО-8, ОЗС-7||Sv-08HA, Sv-10G2, Sv-08MX|
|E50A||490.3 (50)||20||1275 (13)||UОНИИ-13/55, ДСК-50, АНО-7, АНО-9, АНО-10, АНО-11, АНО-15, АНО-16, УП-1/55, УП-2/55|
|E55||539.4 (55)||20||1177 (12)||USSR-13 / 55U, U340 / 55||
Sv-10, HG2CMA, Sv-08H2, SMH, Sv-08HGS,
|AN-47. AN-22, AN-17M||Sv-08MX, Sv-08N2M|
|E60||588.4 (60)||18||981 (10)||USSR-13/65, U340 / 65, WAF-65|
|E70||686.5 (70)||14||588 (6)||48H-1, ANP-2, K-70, LKZ-70||AN-22, AN-17M||Sv-08ХМА|
|E85||633.6 (85)||12||490 (5)||UОНИИ-13/85, ЦЛ-18, ЦЛ-18МО||-||-||-||-|
|E100||980.6 (100)||10||490 (5)||ЦЛ19−63|
|E125||1225.8 (125)||8||392 (4)||NIAT-3||-||-||-||-|
|E150||1471.0 (150)||6th||392 (4)||-||-||-||-|
If the steel seamless pipes are made of different steel grades, the following types of welding electrodes are used:
|Stamps of steels from which pipes are made||Art. 3, 10, 20||10Г2, 09Г2С||17GS, 17G1S, 15GS, 16GS||
Butt welding can also be used welding or flux cored wire.
Buy seamless steel pipes at economically favorable prices from the manufacturer offers the company Electrovek-steel. The supplier guarantees the timely delivery of products to any point specified by the customer.
Before welding in winter conditions, the pipes are heated (inductors or gas burners are used), and electrodes or fluxes are calcined. Concerning steel seamless pipes, the dimensions and quality of the ends are checked, the absence of rolling defects (nicks, dents, voids, cracks). Similar control is also carried out for the welded pipeline valves. Preparing the joints for welding consists in cutting the ends of the pipes. The cutting method and geometric parameters of the end face are established depending on the chosen welding technology.
Butt welding of seamless steel pipes is carried out in the following sequence:
Clamping of the interface (until the consumable material is filled at least half of its height);
Overlaying of the second layer (in case of interruptions in work it is recommended to warm the joint site with asbestos linings);
The applied roller should be as flat as possible. After surfacing, the flux residues must be removed;
When the required parameters for the height and width of the weld reinforcement zone are reached, the welding is considered complete, and the performer’s stamp is stamped on the finished joint.
Buy at a bargain price seamless steel pipes company offers Electrovek-steel. The supplier guarantees the timely delivery of products to the address specified by the consumer.