Some reputed online magazines like Ezinearticles, Hubpages, Mashable, Techcrunch etc., consist of loads of information on a slew of niches. To extract your data from these online mags, you can type your keyword along with the name of the magazine, for example, Electric welding+Ezinearticles.
All these tips could work wonders in enabling you find the most relevant, recent and refreshing content on which you can base your own write-up. However, make sure that you must not do a cut-copy-paste of the result, except the technical terms. Instead, try to extract the idea and develop your own original content from the scratch.