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Home Pores or cracks

Pores or cracks? – Moisture in the shielding gas

The purity of a shielding gas plays an important role both in processing sensitive metals such as titanium and in welding common structural steels and aluminium. The quality requirements for shielding gases for welding are defined in the ISO 14175 standard.

In spite of the high level of gas purity, pores or hydrogen cracks are a frequent occurrence. The most common cause for this is moisture. This is introduced mainly through the gas hoses, as well as through leaks in the gas supply system. The shielding gases should be supplied using hoses that comply with ISO 3821 (formerly 559). These hoses can be easily recognized since the name of the standard is imprinted on them.

Many users use compressed-air hoses of the quality typically available in DIY superstores. While they cost significantly less, they do have clear disadvantages: the moisture in the air passes through the wall of the hose to the inside, where it is transferred to the dry shielding gas and only slowly purged again.

Moisture through hoses


This means that the quality supplied by the gas manufacturer cannot be fully exploited.

Our advice: Make sure you get certified quality when purchasing accessories! One of our technical consultants will be glad to help you with your selection.