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2. Hot work - Wikipedia

   en.wikipedia.org/wiki/Hot_work

   In some countries, such as the UK and Canada, [2] a hot work permit is required for hot work. [1] The purpose of a hot work permit is to effect "the employer's written authorization to perform hot working operations". [3] The UK's Health and Safety Executive suggests that a hot work permit should specify: what work will be done;

3. Permit-to-work - Wikipedia

   en.wikipedia.org/wiki/Permit-to-work

   Permit-to-work adherence is essential in process safety management. Examples of high-risk jobs where a written permit-to-work procedure may need to be used include hot work (such as welding), confined space entry, cutting into pipes carrying hazardous substances (breaking containment), diving in the vicinity of intake openings, and work that ...

4. Work permit - Wikipedia

   en.wikipedia.org/wiki/Work_permit

   A work permit or work visa is the permission to take a job within a foreign country. The foreign country where someone seeks to obtain a work permit for is also known as the "country of work", as opposed to the "country of origin" where someone holds citizenship or nationality. [1]

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7. Hot working - Wikipedia

   en.wikipedia.org/wiki/Hot_working

   The lower limit of the hot working temperature is determined by its recrystallization temperature. As a guideline, the lower limit of the hot working temperature of a material is 60% its melting temperature (on an absolute temperature scale). The upper limit for hot working is determined by various factors, such as: excessive oxidation, grain ...