What are the welding parameters

Clamp meter for checking the welding parameters

Image 1, source: StiCo planning and Stahl GmbH & Co. KG

For EXC2 according to EN 1090-2, EN ISO 3834-3, 14.3 requires, among other things, the control of the essential welding parameters at suitable time intervals, e.g. the arc voltage, the welding current and the welding speed. This requirement is not new; according to DIN 18800, this requirement already existed. The solution suggested - by others - is the purchase of new welding machines or retrofitting with calibrated displays. Such a possible cost explosion cannot be correct and is therefore not a requirement of the regulations! The advisors of the associations in the metal trade recommend purchasing a clamp meter.

The question from practice is justified: "Why, what for, what or whom does it help?"

The answer can be found relatively simply from the experience I have gained as a welding supervisor and also when taking welding exams.

As an example, I will take a welder who is mainly involved in the manufacture of railings. Often it is about rather thin construction materials. This welder is now to be used in steel construction for welding sheet metal in the thickness range of 30 mm. How should the device be set. There is a WPS, maybe even a supplementary work instruction, from which the switch positions of the devices emerge. Often, however, the device is simply adjusted so that it sounds good and the seam looks “pretty”. The inside of the seam often deviates from the outside appearance. Work samples in which the seam is broken, for example, are initiated too seldom.

With a clamp meter, the welding supervisor can very easily check whether the welding parameters are being adhered to. Together with a well-executed visual inspection and observation of the welder, the quality of the seams can be assessed.

The skill of the welder can also be assessed to a lesser extent. If the contact tube distance is different during welding, the other values ​​will also fluctuate.

It is very easy to use. To measure the welding current, simply place the pliers around the hose package, see picture.

For EXC2 according to EN 1090-2, EN ISO 3834-3, 14.3 requires, among other things, the control of the essential welding parameters at suitable time intervals, e.g. the arc voltage, the welding current and the welding speed. This requirement is not new; according to DIN 18800, this requirement already existed. The solution suggested - by others - is the purchase of new welding machines or retrofitting with calibrated displays. Such a possible cost explosion cannot be correct and is therefore not a requirement of the regulations! The advisors of the associations in the metal trade recommend purchasing a clamp meter.

The question from practice is justified: "Why, what for, what or whom does it help?"

The answer can be found relatively simply from the experience I have gained as a welding supervisor and also when taking welding exams.

As an example, I will take a welder who is mainly involved in the production of railings. Often it is about rather thin construction materials. This welder is now to be used in steel construction for welding sheet metal in the thickness range of 30 mm. How should the device be set. There is a WPS, maybe even a supplementary work instruction, from which the switch positions of the devices emerge. Often, however, the device is simply adjusted so that it sounds good and the seam looks “pretty”. The inside of the seam often deviates from the outside appearance. Work samples in which the seam is broken, for example, are initiated too seldom.

Image 2, source: StiCo planning and Stahl GmbH & Co. KG

With a clamp meter, the welding supervisor can very easily check whether the welding parameters are being adhered to. The quality of the seams can be assessed together with a well-executed visual inspection and observation of the welder.

The skill of the welder can also be assessed to a lesser extent. If the contact tube distance is different during welding, the other values ​​will also fluctuate.

It is very easy to use. To measure the welding current, simply place the pliers around the hose package, see Fig. 1 below:

Fig. 1, source: StiCo planning and Stahl GmbH & Co. KG).

The welding current can then be read on the display. As a rule, especially with simple constructions in EXC1, this is completely sufficient. The tension is measured in parallel with the test cords, see Figure 2.

The measurement does not have to take place for every weld seam, but at suitable time intervals that are determined by the welding supervisor. If preheating and interpass temperatures play a role in your own operation, it is advisable that the measuring device also allows temperature measurements via a contact thermometer.

Do you have questions on this topic? Talk to your technical advisor in the regional or federal association.

Note: Metall & mehr GmbH offers clamp measuring devices at favorable membership conditions. Until December 31, 2014: approx. 20% discount on the PeakTech clamp meters P 1625 and P 1655.

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Federal Association of Metal

Huttropstrasse 58

45138 Essen

[email protected]

Credit:
Image 1, source: StiCo planning and Stahl GmbH & Co. KG
Image 2, source: StiCo planning and Stahl GmbH & Co. KG