Enhancing Laser Welding Safety: A Detailed Checklist for Handheld Laser Welding Machines (HLMs)

Laser welding has revolutionised the metalworking industry, offering precision and efficiency. However, the integration of handheld laser machines (HLMs) necessitates stringent safety protocols to protect operators and maintain compliance with regulatory standards. Building upon our previous discussion on laser welding safety, this article introduces a comprehensive checklist designed to ensure the safe operation of HLMs.

Understanding the Regulatory Framework

In the UK, the safety of machinery, including HLMs, is governed by the Supply of Machinery (Safety) Regulations 2008, which align with the EU Machinery Directive 2006/42/EC. Additionally, the British Standard BS EN ISO 11553-2 specifies safety requirements for laser processing machines, particularly hand-held devices. Adherence to these regulations is crucial for legal compliance and the safeguarding of personnel for the use of any form of Laser Welding machinery in the UK.

The Comprehensive Safety Checklist

The following checklist serves as a practical tool for employers, laser safety officers, and operators to assess and enhance the safety measures associated with HLMs.

Machine Identification and Documentation

• Ensure the HLM displays a type plate with the manufacturer’s address, CE marking, and appropriate laser warnings.
• Verify the availability of an operating manual in English or a language understood by the operator.
• Confirm possession of an EU Declaration of Conformity, referencing standards such as ISO 11553-2 and IEC 60204-1.

Control and Safety Mechanisms

• Check for a two-stage trigger mechanism – a single trigger can easily be activated by accident, whereas a two-stage trigger adds an extra level of safety.
• Check for the presence of an authorisation device, like a key switch, to prevent unauthorised use of the machine.
• Ensure interfaces for external safety devices (e.g., door contact switches) are available and properly documented.
• Verify the existence of fibre break and connector detection (safety interlock) systems, with corresponding instructions.
• Confirm the installation of a lockable main switch equipped with an emergency stop function.

Emission Control and Warning Systems

• Assess measures preventing unintended laser emission activation.
• Ensure emission warning devices are present on both the laser source and the hand-held laser head.
• Verify the HLM is equipped with a workpiece contact control mechanism.
• Check for technical measures that prevent laser radiation from propagating in unintended directions.

Electrical Safety and Emission Management

• Confirm that the nozzle and housing of the hand-held laser head are electrically insulated.
• Ensure adequate extraction and filtration systems are in place to manage gaseous and particulate emissions during laser processing.

Operational Area Safety

• Define and demarcate the laser operational area clearly.
• Install emission warning lights at all entrances to the laser area to alert personnel.

Organisational and Personal Protective Measures

• Appoint a qualified laser safety officer and delegate appropriate responsibilities.
• Provide comprehensive training for all potential users on the safe operation of the HLM.
• Conduct regular briefings on the hazards associated with HLMs and the necessary protective measures.
• Advise on occupational health precautions related to exposure to optical radiation and welding fumes.
• Supply suitable protective gloves and ensure their use by personnel.
• Mandate the wearing of appropriate long-sleeved, high-neck protective clothing.
• Require the use of laser safety helmets or visors, possibly in combination with laser safety goggles, all bearing clear identification and certification marks.

 Conclusion

The integration of handheld laser machines into manufacturing processes offers significant advantages but also introduces specific safety challenges. By systematically applying this checklist, organisations can enhance their safety protocols, ensuring compliance with UK regulations and safeguarding their workforce. Regular reviews and updates of safety measures, in line with technological advancements and regulatory changes, are essential for maintaining a safe working environment.

For more detailed information on laser welding safety, you can download our full checklist here, or contact our Laser Welding Team who can advise on appropriate safety requirements and set-ups. If you’re interested in more information on our range of Laser Welders, check out our selection of IPG LightWELDs.