Advanced German CLOOS TANDEM double wire welding technology

In order to improve the welding production efficiency and welding technology level of China's industrial enterprises, Zhuhai Jinbao Hot Melt Welding Technology Co., Ltd. introduced TANDEM high-speed and high-efficiency welding technology from the world-famous German CLOOS company, and promoted it in China. In the past 10 years, CLOOS has provided users with more than 1000 Tandem welding systems. More than 100 TANDEM welding systems are now in use in the country.

When welding 2 -3mm thin plates with the Cruise TANDEM process, the welding speed can reach 6m / min. When welding thick plates of 8mm or more, the welding efficiency can reach 24kg / h. In the welding, low-alloy high-strength steel and other materials are required to control the line energy. Time is the best process to replace submerged arc welding. The process can weld various metal materials such as carbon steel, low alloy steel, stainless steel, aluminum, etc. It is an advanced welding technology with high speed, high efficiency and wide application. Due to the high welding speed, this welding can only be achieved on robots and automatic welding.

First, TANDEM welding system principle:

In the early 1970s, Cruise adopted a twin-wire MIG welding process. In the 1990s, Cruise developed the Tandem welding process. As shown in Figure 1, it can be seen that the two welding processes are fundamentally different. in

Tandem welding uses two separate nozzles and two independent power supplies, each with its own independent welding parameters. The ordinary double wire welding process uses the same welding parameters for both welding wires.

Due to the new development of welding power technology and good welding results, the Tandem welding process replaced the ordinary twin wire welding system in the 1990s. For Tandem welding, it is important that pulsed arcs are used for both wires, which gives the user sufficient conditions to weld with different pulse frequencies, see Figure 2.

Figure 2 Several different combinations of pulse waveforms for Tandem welding:
A) in phase with the same frequency
B) The phase difference of the same frequency is arbitrarily adjustable
C) Different frequency phase free

Second, TANDEM double wire welding process features:
1. High-performance welding machine, welding current 1000A at 100% duty ratio, pulse current 1500A;
2, digital dual-pulse power supply, 6-inch LCD display, programmable, connected to PC, printer;
3, the specification parameters of each wire can be set separately, the material and diameter can be different;
4, the wire feeding speed of each wire can reach 35m / min;
5, greatly improve the deposition efficiency and welding speed;
6. Maintain a lower heat input when the deposition efficiency increases;
7. The arc is stable and the droplet transfer is controlled;
8, welding deformation is small;
9, small splash;
10, welding data monitoring and management, error code display;
11, using standard gas, less air consumption;
12, a wide range of use, high productivity.
Third, MIG/MAG single wire welding and TANDEM application comparison:
Comparison of MIG/MAG monofilament and TANDEM applications are shown in Table 1 and Figure 2, respectively.
Table 1 Comparison of MIG/MAG monofilament and TANDEM applications

Figure 2 Comparison of single wire welding and TANDEM welding efficiency

Fourth, TANDEM application
TANDEM can be applied to the welding of various metal materials such as carbon steel, low alloy steel, stainless steel, aluminum alloy, etc., and is suitable for various joint forms. An application example is shown in Table 2.

Table 2: TANDEM Application Examples

All in all, high-speed welding and high deposition rate welding are the development direction of welding technology in the future, and TANDEM high-speed and high-efficiency welding is one of the hot spots, and it will be more and more widely used in industrial production.

About the author: Wei Zhanjing Master of Engineering, Senior Engineer MBA

1988 Harbin Institute of Technology, graduated in welding
1991 Graduated from the Graduate School of Mechanical Science, now engaged in the promotion and application of German CLOOS welding equipment in China.