EWM Pico 162 Operating Instructions Manual page 32

Rectifying faults
Checklist for rectifying faults
Unstable arc
 Material inclusions in the tungsten electrode due to contact with filler material or workpiece

Regrind or replace the tungsten electrode
 Incompatible parameter settings

Check settings and correct if necessary
Pore formation
 Inadequate or missing gas shielding

Check shielding gas setting and replace shielding gas cylinder if necessary

Shield welding site with protective screens (draughts affect the welding result)

Use gas lens for aluminium applications and high-alloy steels
 Unsuitable or worn welding torch equipment

Check size of gas nozzle and replace if necessary
 Condensation (hydrogen) in the gas tube

Purge hose package with gas or replace
32
099-002040-EW501
28.04.2014