SU1234112A1 - Method of resistance welding - Google Patents

Description

The invention relates to a process for the production of permanent joints of metal parts, and more specifically to methods of resistance welding.

The purpose of the invention is to increase the strength of beryllium welds.

FIG. 1 is a schematic diagram of the method for welding beryllium parts; in fig. 2 - welding scheme of beryllium with stainless steel and titanium alloy.

Two polished to clean surface Rc, l, 25 µm discs I and 2, from which the oxide film was previously removed, are made of beryllium with a thickness of 1 mm and an 8 mm diameter placed on the lower welding electrode 3, which in turn is mounted on the bottom base 4 condenser machine. The compression pressure of the plates to be welded 1 and 2 is transmitted from the loading device (not shown in Fig. 1) to the upper welding electrode 5, which is mounted in the upper base 6 of the welding machine. After pressing the parts to be welded to P 5–9 t / cm, a pulse of the welding current of the beam shank is passed through, the current density is j 10 - 10 A / cm.

In a similar way, beryllium is welded with I2X18H10T stainless steel and VT1-0 titanium alloy. A part 7 of stainless steel 12X18H10T, wall thickness 1 mm (or VT1-0 titanium alloy) is installed on the lower base 4 of the capacitor welding machine, on which

Be + Be

10-5

Be + BTi-0

10-5

Be + 12X18H10T 10-5

122

The beryllium part 8 is placed with a thickness of 1 mm and a diameter of 8 mm. The contact surfaces of the parts to be welded are polished to a purity of 1.25 microns, and the oxide film is removed from the beryllium part. The compression pressure of the parts to be welded 7 and 8 is transmitted from the loading device (not shown in Fig. 2) to the upper welding electrode 5 of Mo. After pressing the parts to be welded to P 5–9 t / cm, a pulse of welding current with a duration of T 10 –10 s and a current density of 10–10 A / cm is passed.

Conducted research to verify the efficiency of the process makes it possible to obtain high-quality welded joints of beryllium with beryllium, titanium alloy VT1-0 and stainless steel 12X18H10T.

The table shows the modes of welding beryllium and characteristics of the parts to be welded.

As can be seen from the table, durable and high-quality welded joints ((je, 32–34 kg / mm for a pair of Be + Be, dg 31–33. Kg / mm for a pair of Be + Blt-O and dg 34–47 kg / mm for the pair Be + 12X18H10T) are obtained with welding modes P 5-9 t / cm,% 10 s, j A / cm.

The use of the proposed method of resistance welding can improve the quality of beryllium welds, which are necessary for the manufacture of x-ray exit windows.

Weld is leaking (intermittent weld, metallography

Note. The dependence of the strength of the joints of materials on the cleanliness of the surfaces of the parts to be welded and the pressure of compression was determined at optimal parameters of the current pulse.

Table continuation

2

Claims (1)

METHOD OF CONTACT WELDING, mainly beryllium, according to which, before welding, the surfaces of the parts to be welded are cleaned of the oxide film, polished and heated are pre-compressed parts by passing a welding current, characterized in that, in order to increase the strength of the welded joints, the surfaces to be polished are polished to a purity R _a i 1.25 μm, and the compression of the welded parts is carried out by the force P = 5-9 t / cm ² . Fig.!