Welding Operation Precautions ER4047

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Category	Key Items	Specific Precautions
1. Safety Protection	Head & Face Protection	Wear a safety-compliant welding helmet that covers the entire face and neck to prevent arc burns on the skin and eye damage from intense light. Do not wear loose accessories (e.g., earrings, necklaces) during operation; tuck long hair into a protective cap.
	Eye Protection	For root welding or light-duty welding, use specialized welding goggles together with the helmet. The lens shade number must match the welding current (a higher current requires a higher shade number).
	Hand Protection	Wear high-temperature-resistant welding gloves with tightly fitted cuffs to prevent metal spatter from entering the gloves. Replace gloves immediately if they are damaged; never use thin gloves or work with bare hands.
	Body Protection	Wear flame-retardant protective clothing that covers below the waist, with cuffs and trouser legs tightened. Avoid wearing flammable fabrics (e.g., chemical fiber, cotton). Do not work in shorts, short sleeves, or sandals.
	Respiratory Protection	In poorly ventilated environments (e.g., confined spaces, indoor areas), wear dust and toxic gas masks (for welding fumes) or respirators. When welding alloys containing zinc, lead, etc., enhance ventilation and use specialized protective gear to avoid inhaling harmful gases.
2. Pre-Welding Preparation	Environment Inspection	Clear flammable and explosive materials (e.g., gasoline, alcohol, cartons) within 5 meters of the work area. If removal is not possible, isolate them with fire blankets or fire barriers. Ensure good ventilation: turn on exhaust fans or open skylights for indoor operations; avoid strong winds and rainy weather for outdoor operations (outdoor welding is strictly prohibited in rain to prevent electric shock). If there are flammable materials or pedestrian traffic below the work area, lay fire blankets and set up warning signs.
	Equipment Inspection	Check the appearance of welding equipment (welding machine, welding torch/electrode holder, cables, etc.) to ensure no damage or aging. Cable connectors must be secure, with no loose or exposed copper wires. For gas-shielded welding (e.g., TIG welding, MIG/MAG welding), test gas pipelines for leaks using soapy water (no bubbles indicate qualification). Fix gas cylinders on dedicated brackets; do not place them horizontally. Verify that the grounding device is reliable: both the welding machine and the workpiece must be effectively grounded, with a grounding resistance not exceeding 4Ω.
	Workpiece Preparation	Clean the welding area of the workpiece to remove oil, rust, scale, and other impurities (using sandpaper or wire brushes). Ensure tight fit of the weld joint to prevent impurities from affecting weld quality or causing porosity. If the workpiece is heavy or requires fixed welding, secure it firmly with fixture clamps to avoid displacement during welding (which may lead to hazards).
3. Welding Process Operation	Parameter Setting	Adjust appropriate welding parameters (welding current, voltage, welding speed, and gas flow rate for gas-shielded welding) based on the welding material (e.g., steel, aluminum), material thickness, and welding method (e.g., SMAW, TIG welding). Excessively high parameters may cause burn-through of the workpiece, while excessively low parameters may result in defects such as incomplete penetration and slag inclusion.
	Operation Standards	Maintain a stable posture during welding; do not let your body come into direct contact with the welding machine or workpiece to prevent electric shock. Keep the welding torch/electrode holder at an appropriate angle to the workpiece (e.g., 50°-70° for SMAW). Avoid keeping the arc in the same position for a long time to prevent local overheating and burn-through. Do not touch the workpiece or weld immediately after welding, as their surface temperature can reach several hundred degrees Celsius and may cause burns. If adjustment of the workpiece is needed, wait for it to cool or use high-temperature tools for assistance.
	Special Situation Handling	If abnormal equipment noise, unusual sparks, or cable overheating occur during welding, turn off the power immediately, troubleshoot the problem, and only resume operation after resolving the issue. If an open flame suddenly appears in the welding area, first turn off the welding machine power and gas valve, then extinguish the flame with a dry powder or CO₂ fire extinguisher (water is not allowed), and evacuate nearby personnel at the same time.
4. Post-Welding Treatment	Workpiece Cooling & Cleaning	After welding, allow the workpiece to cool naturally to room temperature (or use compressed air for auxiliary cooling; do not pour water directly on the workpiece to avoid deformation). Use slag hammers and wire brushes to clean slag and spatter from the weld surface. Inspect the weld appearance: it should be free of cracks, porosity, slag inclusion, incomplete penetration, and other defects, with uniform weld formation.
	Equipment & Environment Finalization	Turn off the welding machine power, disconnect cable connectors, and organize the cables (avoid folding or crushing them). Close the gas cylinder valve, release residual gas in the pipeline, and then disassemble the gas pipeline. Store gas cylinders in designated positions, away from heat sources and open flames. Clean weld slag, waste materials, and tools from the work site, remove warning signs, and confirm no fire hazards before leaving.
5. Emergency Handling	Electric Shock Accidents	Immediately turn off the welding machine power. Use insulating objects (e.g., dry wooden sticks, plastic rods) to move away the cables; do not touch the shocked person directly. If the person is unconscious, call emergency services immediately and perform Cardiopulmonary Resuscitation (CPR) if necessary.
	Burn Accidents	For minor burns (reddened skin, pain), rinse the affected area with cold water immediately for 15-20 minutes and apply burn ointment. For severe burns (blisters, broken skin), cover the wound with clean gauze (avoid squeezing) and send the injured person to the hospital promptly.
	Fire Accidents	If the fire is small, extinguish it with a fire extinguisher or fire blanket. If the fire spreads, evacuate the site immediately, call the fire emergency number, and inform the authorities of the fire location and the type of combustibles (e.g., welding waste, flammable materials).

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ER4047 TIG Welding