A headband arrangement for a welding helmet, comprising: a fixed attachment structure (500; 5000); and a helmet mounting structure (300;3100) cooperating with the attachment structure (500; 5000), wherein at least two stopping positions (1, 2, 3, 4) are defined longitudinally between the attachment structure (500; 5000) and the helmet mounting structure (300; 3100), the helmet mounting structure (300; 3100) is selectively switchable between an unlocking state and a locking state, wherein in the unlocking state, the helmet mounting structure (300; 3100) is slidable between the stopping positions (1, 2, 3, 4) relative to the attachment structure, and wherein, in the locking state, the helmet mounting structure (300; 3100) can be locked to one of the stopping positions relative to the attachment structure (500; 5000), characterized in that the helmet mounting structure (300; 3100) can be held in the locking state by a magnetic force generated between a pair of magnetic parts (410, 420; 4100; 4200), wherein the helmet mounting structure (300; 3100) comprises a lockable component which is mounted such that it is pivotable about a pivotal shaft in the helmet mounting structure (300; 3100), the pair of magnetic parts (410, 420; 4100, 4200) comprise a first magnetic part (410; 4100) secured on the lockable component and a second magnetic part (420; 4200) secured on the helmet mounting structure (300; 3100) or the attachment structure (500; 5000); the helmet mounting structure (300; 3100) can be switched between the unlocking state and the locking state by rotating the lockable component, and in the locking state, the helmet mounting structure (300; 3100) is kept to be locked by a magnetic attractive or repulsive force generated between the first and second magnetic parts (410, 420; 4100, 4200). a fixed attachment structure (500; 5000); and a helmet mounting structure (300;3100) cooperating with the attachment structure (500; 5000), wherein at least two stopping positions (1, 2, 3, 4) are defined longitudinally between the attachment structure (500; 5000) and the helmet mounting structure (300; 3100), the helmet mounting structure (300; 3100) is selectively switchable between an unlocking state and a locking state, wherein in the unlocking state, the helmet mounting structure (300; 3100) is slidable between the stopping positions (1, 2, 3, 4) relative to the attachment structure, and wherein, in the locking state, the helmet mounting structure (300; 3100) can be locked to one of the stopping positions relative to the attachment structure (500; 5000), characterized in that the helmet mounting structure (300; 3100) can be held in the locking state by a magnetic force generated between a pair of magnetic parts (410, 420; 4100; 4200), wherein the helmet mounting structure (300; 3100) comprises a lockable component which is mounted such that it is pivotable about a pivotal shaft in the helmet mounting structure (300; 3100), the pair of magnetic parts (410, 420; 4100, 4200) comprise a first magnetic part (410; 4100) secured on the lockable component and a second magnetic part (420; 4200) secured on the helmet mounting structure (300; 3100) or the attachment structure (500; 5000); the helmet mounting structure (300; 3100) can be switched between the unlocking state and the locking state by rotating the lockable component, and in the locking state, the helmet mounting structure (300; 3100) is kept to be locked by a magnetic attractive or repulsive force generated between the first and second magnetic parts (410, 420; 4100, 4200).