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img ART 9211 M10x200 A2 SW7 + DIN 934 (x3) +DIN 125 (x3) + 9082 EPDM 9211-10-200-2SWКом934/125
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Welded fastening. Types and applications.

Welded fastening: metal screws and nuts for installation by the welding method

Welded fastening: metal screws and nuts for installation by the welding method

There are a number of ways of attaching bolts, bushings, pins and other metal products to sheet metal. Pressing, flaring and riveting have their advantages, but they require the preliminary creation of holes. Welded fastening allows you to avoid unnecessary operations. Welded nuts and welded screws are mounted by the welding method almost instantly - in just a few seconds or even milliseconds.

 

Welded fastening

Welded fasteners are used in a wide variety of fields: welded screws and welded nuts are used in heavy industry, machine and shipbuilding, thermal power engineering, bridge construction, etc. Special welding machines are used to connect the fastener to the sheet metal base.

They provide melting of the metal at the attachment point and press the fastening product into the melt. The welding gun works reliably and precisely, therefore the fastening of welding sleeves and welding studs is often called a shot.

Welding fasteners are used for metal products made of various types of steel (copper-plated, stainless, etc.), aluminum, brass, and other metals. The minimum thickness of the metal sheet depends on the welding technology and generally starts at 0.5 mm.

 

Welded fastening: installation methods

In order to fasten welding screws or welding nuts, various welding technologies are used. Among them, 4 most popular methods can be distinguished.

  • Condenser welding – is a technology that uses the charge energy of the capacitors of the welding machine. It instantly melts the tip (weld screw ISO 13918, DIN 32501) or special protrusions on the end of metal products (wel
  • Contact arc welding for similar metal products is more reliable. Here they use welding lasting up to 2 seconds. Under the action of direct current, a continuous electric arc is created between the working surface of the metal product and the sheet metal base. To protect against melt leakage, the welding point of the pin or sleeve is protected. This is done using an inert gas or special ceramic rings that come with the fastener, as in the Nelson ISO 13918 stud.
  • Pulse contact-arc welding– is a simple variant of contact-arc welding with a limitation of the duration of the electric arc. The use of preventive solutions against melt leakage is not mandatory.
  • Welding with a rotating arc, is used only for hollow metal products (weld sleeves and nuts). It ensures melting of only the edge of the special fastener due to the rotation of the magnetic field. This expensive and complex welding method is recommended for the accurate attachment of metal products to thin metal bases.
Welding technologies

 

Welding screws and welding nuts

The following products are most widely used for welding fastening.

  • The ISO 13918, DIN 32501 stainless steel or copper-plated weld screw can be either an externally threaded or unthreaded weld stud or an internally threaded weld sleeve. As already mentioned, welding is provided by a metal tip on the end of the screw.
  • Square weld nut DIN 928, PN 82169 made of different types of steel is indispensable for fastening to sheet metal. Here, welding provides four projections on the underside of the nut.
  • Hexagon weld nut DIN 929, PN 82169 is welded similarly to the previous version due to the use of three projections on the lower end of the product.
  • Weld nut, ART 9060 stainless steel can have convex (form A) or concave (form B) weld points or no weld points at all (form C). The shape of the welding points determines the method of fastening the product.
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