What an HR can do in workplace for the betterment of employee welfare?

As per my experience HR must know his scope and nature of work and if he only do his work properly that is more than enough. 

Provide attractive packages, friendly enviornment and opportunity to excel.

first he should aply the law - employees relations channels - enhance managment employees communication - develop and recognize employees

Bridge between employer & employee to strike balance & facilitate investments in human capital (the most precious resource & key success factor). I strongly believe there are HR leaders out there doing this.

defined labour welfare as a term which is understood to include such services, facilities and amenities as may be established in or in the vicinity of undertakings to enable the persons employed in them to perform their work in healthy, congenial surroundings and to provide them with amenities conducive to good health and high morale.

Welfare includes anything that is done for the comfort and improvement of employees and is provided over and above the wages. Welfare helps in keeping the morale and motivation of the employees high so as to retain the employees for longer duration. The welfare measures need not be in monetary terms only but in any kind/forms. Employee welfare includes monitoring of working conditions, creation of industrial harmony through infrastructure for health, industrial relations and insurance against disease, accident and unemployment for the workers and their families. 

Labor welfare entails all those activities of employer which are directed towards providing the employees with certain facilities and services in addition to wages or salaries. 

HR should have constructive feedbacks from employees in timely manner,should address to grievances as Amal indicated. Should carry out Employee and Employer friendly policies which is accepted by all and doesnt give any advantages to either of parties so it keeps balance. 

Should have meetings with Management to improve performance enhancment programs, structured incentives, get togethers, team building exercises, training & development programs to enhance skills, Most important work on employee retention by not allowing a precious talent to drain away.

Attractive bonus,conduct training program which would able to conduct work with more alert and vigilance and also make friendly environment to get success throughout the era.

Providing appropriate trainingApplication methods AlhaddthStimulus material and moral

Hire the best people you can afford to do the job.

Device and implement the most efffective performance mesurment processes for each job to ensure achieving the organization'f goals.

Plan employee development programs

Monitor employee satisfaction and do what you can to emprove it

Do it some employee's engagement activies like fun activities and arrange family get together in six months once.

Organize one tour for employees. You have to create some sort activities, so employees would be happy and they will stay with your concern.

• Labor welfare includes various facilities, services and amenities provided to workers for improving their health, efficiency, economic betterment and social status.
• Welfare measures are in addition to regular wages and other economic benefits available to workers due to legal provisions and collective bargainin.  
• Labor welfare schemes are flexible and ever-changing. New welfare measures are added to the existing ones from time to time.