[TheForge] RE: Fact or urban myth?

[Michael]

Recently I came across a warning against using hydrogen in welding equipment
previously used with acetylene, due to the possibility of explosion when
hydrogen gas encounters acetylene residues.

I wrote to the person who had posted this warning on his site, and received
his assurances that the danger was very real, and that he had checked his
facts with knowledgeable people who were involved in both oxy-hydrogen and
oxyacetylene welding back in the thirties and forties.

Nevertheless, I can find no mention of this hazard anywhere else. If someone
can throw more light on the issue, I'd be obliged.
Mikey