div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: Microsoft · 2019 2 22 · 20% oxygen while weldingindustrial oxy- gen consists of 997% or greater pure oxy- gen Any concentration of oxygen above 235% lowers the ignition src=https:reader036vdocumentscoreader036viewer202207020460f29b16959ff13d2d588f85html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 2button div class=ts-image amp-img class=ts-thumb alt=Page 2: Microsoft · 2019 2 22 · 20% oxygen while weldingindustrial oxy- gen consists of 997% or greater pure oxy- gen Any concentration of oxygen above 235% lowers the ignition src=https:reader036vdocumentscoreader036viewer202207020460f29b16959ff13d2d588f85html5thumbnails2jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 3button div class=ts-image amp-img class=ts-thumb alt=Page 3: Microsoft · 2019 2 22 · 20% oxygen while weldingindustrial oxy- gen consists of 997% or greater pure oxy- gen Any concentration of oxygen above 235% lowers the ignition src=https:reader036vdocumentscoreader036viewer202207020460f29b16959ff13d2d588f85html5thumbnails3jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 4button div class=ts-image amp-img class=ts-thumb alt=Page 4: Microsoft · 2019 2 22 · 20% oxygen while weldingindustrial oxy- gen consists of 997% or greater pure oxy- gen Any concentration of oxygen above 235% lowers the ignition src=https:reader036vdocumentscoreader036viewer202207020460f29b16959ff13d2d588f85html5thumbnails4jpg width=142 height=106 layout=responsive amp-img divdiv